Maneuverability vs Speed (1 Viewer)

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The six landing sites of Operation Sealion would have put civilians in harm's way.

The Luftwaffe was to drop mines in planned corridors ahead of the landings and then saturate bomb inland ahead of the assault along with waves of fighter ground attack sweeps.

I cannot begin to see how any of that would be in the least part enjoyable to those on the receiving end.
The following 5 years of war wasn't enjoyable either, if sealion went ahead it would have been a catastrophe for Germany, it would have shortened the war.
 
Exactly. The civilian casualties would have been tremendous.
What were the civilian casualties after the BoB, tremendous. People die in war, but if the attacking side takes a tremendous loss like Germany would have taken when the Royal Navy swept through the invasion fleet the damage inflicted would have ultimately shortened the war, saving more lives as a result.
 
The two water battles of Narvik took place when the Germans first landed. The action involving Glorious was at the end
of the campaign. That's why I was curious.

Losses to the RN at Narvik were two destroyers with German losses at ten destroyers.

In 1939 Britain had 184 destroyers. Germany had 22.

At Narvik Germany lost 45% of it's remaining destroyer fleet opposed to the RN loss of less than 4% (including Acasta and Ardent).

Glorious going down put Britain back to six carriers with five more under construction opposed to Germany having zero.

The loss of destroyers hampered escort of larger ships in future operations (not that the Z class was all that good in the open
Atlantic anyway).

This was Germany's problem with an invasion of Britain. Not enough to control the channel.Thanks for

The two water battles of Narvik took place when the Germans first landed. The action involving Glorious was at the end
of the campaign. That's why I was curious.

Losses to the RN at Narvik were two destroyers with German losses at ten destroyers.

In 1939 Britain had 184 destroyers. Germany had 22.

At Narvik Germany lost 45% of it's remaining destroyer fleet opposed to the RN loss of less than 4% (including Acasta and Ardent).

Glorious going down put Britain back to six carriers with five more under construction opposed to Germany having zero.

The loss of destroyers hampered escort of larger ships in future operations (not that the Z class was all that good in the open
Atlantic anyway).

This was Germany's problem with an invasion of Britain. Not enough to control the channel.


Thanks for the info, I was going from memory so didn't remember all of that. And yes the high sea's fleet got its butt handed to it.

But all it needed to worry about in a hypothetical invasion was a corridor 20 miles wide. Where it could concentrate its aircraft, and U boats.

The British couldn't afford to lose a significant percentage of its fleet because they still had a worldwide empire to protect. And that is something that was always in the back of their mind.

And, like I have said before, I am not saying the Germans should have invaded, or were likely to prevail.

Far from it. I have merely said that if they had gambled there is a small window after Dunkirk where it may have succeeded.

The British thought that too. That's all I have been saying.
 
What were the civilian casualties after the BoB, tremendous. People die in war, but if the attacking side takes a tremendous loss like Germany would have taken when the Royal Navy swept through the invasion fleet the damage inflicted would have ultimately shortened the war, saving more lives as a result.
Sure, but nowhere near what they would have been in the event of an invasion attempt.
 
Losses to the RN at Narvik were two destroyers with German losses at ten destroyers.

In 1939 Britain had 184 destroyers. Germany had 22.

At Narvik Germany lost 45% of it's remaining destroyer fleet opposed to the RN loss of less than 4% (including Acasta and Ardent).

Glorious going down put Britain back to six carriers with five more under construction opposed to Germany having zero.

The loss of destroyers hampered escort of larger ships in future operations (not that the Z class was all that good in the open
Atlantic anyway).
It was even worse for the Germans as we are just counting lost ships, not damaged.
And the Germans lost, although not to RN surface ships, one heavy cruiser and two light cruisers.
The Deutschland also caught a torpedo on her way home.
A fair number of the German destroyers that were not sunk had been damaged and some were still under repair in Sept 1940.
The Germans had very little to actually fight with in the channel during the summer/fall of 1940.
And anything over 1000 tons was in Germany and would have been spotted moving towards the channel or at least that it/they had moved.
 
Japan expecting to end WWII by treaty was one of those foundation assumptions no one questioned, after all that is how all of Japan's modern wars had ended, also WWI, and as of 1941 no one believed the US could mount an invasion of Japan, blockade it yes, invade no. In 1945 the US trans continental rail links could not carry the necessary traffic, ships had to be loaded in the east coast ports, to give an idea of the invasion effort required.

On to 1940 Britain. Keith Park was worried about the fighter control system, not airfields, given most were large grass fields knocking them out was hard, the control rooms were on the airfields and above ground, the Germans used direction finding to figure out where to bomb. The fighting in late August and early September was slowly grinding the RAF down but the Germans were on a strict timetable. The strikes on London did what the Luftwaffe hoped, draw in most to all available RAF fighters, making it possible to really up the RAF loss rate.

Given a lack of German naval power and little ability to land heavy weapons, the Luftwaffe was required to defeat and keep defeated Fighter Command, do pre invasion softening up (some hopefully as part of the anti Fighter Command operation). Then from invasion day add, escorting paratroop operations, shield the landing zones and shipping from the RAF and RN, including anti shipping and raids on airfields, provide battlefield support.

A big part of amphibious warfare is the follow up, continually landing more troops and supplies. Getting only one wave ashore probably means defeat. A battleship and even a cruiser are not much better at sinking much the sort of invasion shipping used by the Germans than destroyers, so how many the RN would risk is an open question.

In June 1940 Milch put a plan to Goering to use the remaining paratroopers to create an airhead in Britain, take an airfield and then fly in reinforcements.

From a discussion about Sealion, mostly not my contribution

British Army in Britain, 548 Cruiser Tanks had been built by 30 September 1940; 134 had been lost in France and 137 were in Egypt, which still left over 200 in Britain, enough to equip the four Cruiser regiments of 1st Armoured Division that were active. The situation with Infantry Tanks was even brighter, of 524 completed, 100 were lost in France and 52 had been shipped to Egypt on 18 August leaving well over 350 available, enough to equip the five regiments of the GHQ Reserve 1st and 21st Army Tank Brigade to full War Establishment and leave enough left over to allow the continued training and equipping of the six regiments of 23rd and 24th Army Tank Brigades (essentially a full regiments worth per brigade). And there were a plethora of Light Tanks available, of 1,340 built, 321 had been lost in France and 275 were in Egypt, leaving over 700, more than enough in theory to equip the dozen or so regiments formed to War Establishment. Note that by actual count the three 'light' regiments of 22nd Armoured Brigade averaged 42.33 tanks, 73 percent of their War Establishment of 58. Then, from October to December 1940 another 449 tanks were built, 78 cruiser tanks, 354 'I' tanks, and 17 light tanks.

In terms of newly produced artillery, not counting guns evacuated from France (a total of 322 of all types or roughly one-in-eight had been brought back), there were about 140 2-pdr AT guns, 568 40mm Bofors AA guns, 294 25-pdr guns, 728 3.7-inch AA, and 118 other miscellaneous guns added to the Army from 1 April to 30 September. Also by about 1 October 1940 most, if not all of the shipments of equipment purchased from the US on 11 June had arrived, including 895 M1917 and M1897 75mm guns, each with 1,200 rounds of ammunition, 300 3-inch mortars, each with 325 rounds of ammunition, 1,157 Lewis MG, 7,071 Vickers MG, 10,000 M1917 MG, and 25,000 BAR.

In addition, large numbers of reserve stocks had not been sent to France and so were available. The numbers of artillery in the UK as of the end of May 1940 were: 126 18-pdr, 269 18/25-pdr, 90 25-pdr +252 produced June-September = 342. So 737 total field guns, sufficient for 30 regiments with a small reserve of 17 pieces. That's enough to fully equip 10 divisions. Now a quick check shows there were just 17 regular regiments in the UK at that time, plus 5 RHA, while there were 82 TA, so 104 regiments to be equipped and a requirement for 2,496 pieces in total. That of course amounts a minimal shortfall of about 864 guns to WE, even if we add in the 895 US guns.

Medium guns, 321 4.5-inch howitzer, 14 60-pdr guns (being converted to 4.5-inch), 5 4.5-inch/60-pdr guns (converted), 94 6-inch howitzer. There were something like 27 medium regiments formed, so a requirement for 432 pieces. The 434 available were just sufficient, especially when the production of June-September is added in.

Heavy guns, 20 6-inch gun, 14 8-inch howitzer, 39 9.2-inch howitzer (siege), 29 12-inch howitzer (railway and siege), there were some 12 heavy regiments to man these pieces and to supplement personnel manning the coast defenses.

In terms of 'B' Echelon vehicles, 63,879 had been lost in France, but 54,057 new ones had been produced. The shortfalls there were made up by requisitioning public transport and private motor vehicles.

All US types were utilized at some point by British regular and territorial Home Forces until they could be replaced by regular equipment, being then transferred successively to the Home Counties Brigade Groups (later divisions), then the Home Guards, and finally also to foreign areas and allies (some were later shipped to British Forces Middle East as antitank weapons and then to equip Free French, Greek, and other forces in Egypt and Tunisia). As of mid-September to late-October 1940 (arguably the endpoint of the Sealion 'threat') the following US weapons deployment at a minimum have been identified.

45 (Wessex) Division (2nd Line Terr.) - sector Dymchuch (excl.)-Telscombe 55 Field Regiment (14 - 75mm, two sited as AT, 6 4.5-inch how, 4 -25-pounder) 142 Field Regiment (10 - 75 mm, two sited as AT, 8 - 4.5-inch how) 96 Field Regiment (12 - 75 mm guns, 6 - 4.5-inch hows, 4 - 25-pounder, 2 - 6-pounder sited as AT)

New Zealand 'Division' - in XII Corps reserve 5th NZ Field Regiment (E and F Battery - 8 75mm (ex-US M1897) each, G Battery - 8 25-pdr Mk II)

Emplaced as 'Emergency' beach defense batteries: Gravesend - East Tilbury Battery - one 75mm Pevensey Battery - two 4.7-inch and two 75mm as AT defense Toll Point Battery - two 75mm

For the other divisions active in defending the coast, expect the numbers to be similar.

'Pre-war' artillery was an important part of the early British artillery forces in France and then in the defence of England in late 40 and early 41. The 18-pounder was critical in supplying carriages in 1939-1940 when 25-pounder gun tube production outstripped 25-pounder carriage production and as a supplement to the relatively small numbers of 25-pdrs available. A total of 611 18/25-pdr were converted 1937-1939 and a further 811 1940-1941 when 25-pounder carriage production caught up with demand. However, in addition, 216 complete 18-pounder were taken to France by the BEF and lost there.

As above, we can find that 1st, 3rd, 8th, and 11th Canadian Field Regiments were equipped with a mix of 25-pdr and 18/25-pdr. 31 Infantry Brigade Group (attached to 45 Division) 75 Field Regiment RA had 24 25-pounder and there were some in the divisional regiments and with the New Zealanders, but the Australians had a mix of 5 Fld Bty (12 25-pdr) and 6 Fld Bty (3 18-pdr and 3 4.5-inch howitzers).

The status of the KM as of mid-September:

Heavy Units
BB Bismarck - commissioned 24 August and on sea trials 14 September-5 December 1940. From 6 December 1940 to 24 January 1941 she is at Hamburg refitting and undergoing final construction changes.
BC Gneisenau - 20 June 1940, torpedoed by HMS Clyde, she is at Kiel under repair from 28 July to December 1940.
BC Scharnhorst - 8 June 1940, torpedoed by HMS Acasta, she is at Kiel for repairs from June to December 1940.
CA Scheer - leaves dock at Wilhelmshaven on 31 July 1940 following a major rebuild of her bridge, sea trials and working up continue until 23 October until she sails from Gotenhafen for the Denmark Strait.
CA Lutzow - 11 April 1940, torpedoed by HMS Spearfish and heavily damaged, losing both props and rudder, she is in repair at Kiel and then working up until 12 June 1941 when she is again damaged, this time by a British torpedo bomber and is in repair until January 1942.
CA Hipper - after an unsuccessful Arctic cruise (25 July-9 August) she puts into Wilhelmshaven for maintenance (12 August-9 September), but while running sea trials on 30 September 1940 she suffers a major engine casualty, which puts her out of action until 28 October.
CA Blücher - sunk Oslo Fjord 9 April 1940.
Number Available = Zero

Light Units
CL Emden - built in 1921 and considered obsolete, used only as a training ship, although she was also utilized as a troop transport for Weserübung. Armed with 8 15cm, 2 8.8cm, and 2 2cm guns, 4 torpedo tubes, and 120 mines.
CL Königsberg - sunk 10 April 1940.
CL Karlsruhe - sunk 9 April 1940
CL Köln - the sole survivor of the K-class, they were collectively considered to be of short endurance and structurally unsound. Armed with 9 15cm, 6 8.8cm, and 8 2cm guns, 12 torpedo tubes, and 120 mines.
CL Leipzig - damaged by torpedoes of HMS Salomon 15 December 1939 and out of commission until 1 December 1940.
CL Nürnberg - armed with 9 15cm, 8 8.8cm. 8 3.7cm, and 4 2cm guns, 12 torpedo tubes, and 120 mines.

Number Available = Three

Training Ship Bremse - armed with 4 12.7cm, 4 3.7cm, and 2 2cm guns.

Destroyers and Torpedo Boats
Z1-Z3 - sunk
Z4 - Available
Z5 - Available
Z6 - Available
Z7 - 25 August 1940 puts into Kiel following major engine casualty. Unavailable.
Z8 - Available
Z9 - sunk.
Z10 - Available
Z11-Z13 - sunk
Z14 - Available
Z15 - Available
Z16 - Available
Z17-Z19 - sunk
Z20 - Available
Z21-Z22 - sunk
Z23 - commissioned 15 September 1940 and working up until March 1941
Z24-Z25 - not commissioned yet.
Z26 - commissioned 11 January 1940 and possibly available.

Number Available or Possibly Available = 10

Torpedo boats
TB Möwe - torpedoed by HMS Taku on 9 May 1940 and in repair until spring 1943.
TB Seeadler - Available
TB Albatros - sunk by coastal batteries at Oslo Fjord 10 April 1940.
TB Greif - Available
TB Kondor - Available
TB Falke - Available
TB Wolfe - Available
TB Iltis - Available
TB Luchs - torpedoed and sunk 26 July 1940 by HMS Clyde.
TB Tiger - sunk in collision 25 August 1939.
TB Jaguar - Available
TB Leopard - sunk in collision 30 April 1940.
T1 - damaged by bomb hit 18 September 1940 and in repair until 5 October 1940.
T2 - Available
T3 - Heavily damaged in air attack at Le Havre 19 September 1940 and not re-commissioned until 12 December 1943.
T4 - commissioned 27 May 1940 and first operational 5 October 1940.
T5 - Available
T6 - Available
T7 - Available
T8 - Available
T9 - commissioned 4 July 1940 and first operational 5 October 1940.
T10 - commissioned 6 August 1940 and first operational 27 October 1940.
T11 - Available, but badly damaged by bombs on 17 September
T12 - commissioned 3 July 1940 and first operational 27 October 1940.

Captured
TB Panther - Norwegian, available, but used for coastal escort between Norway and Germany
TB Löwe - Norwegian, available, but used for coastal escort between Norway and Germany
TB Leopard - Norwegian, available, but used for coastal escort between Norway and Germany
TB Tiger - Norwegian, available, but used for coastal escort between Norway and Germany
TB Troll - Norwegian, too old for active duty and converted to a supply ship by fall 1940
TB Zick - Norwegian, available, but used as harbor patrol vessel in Norway
TB Zack - Norwegian, available, but used as harbor patrol vessel in Norway
KT1 - Norwegian, used as coastal patrol in Norway
NS28 - Norwegian, used as coastal patrol in Norway
Kürassier - Norwegian, used as coastal patrol in Norway
Tarantel - Norwegian, used as coastal patrol in Norway
Balte - Norwegian, used as coastal patrol in Norway, salvaged after being scuttled it was in poor condition
Admiral Deinhard - Norwegian, used as a utility harbor boat
Schlange - Norwegian, used as coastal patrol in Norway
Eidechse - Norwegian, used as coastal patrol in Norway
Schildkröte - Norwegian, built in 1899 and too old for service, used for harbor patrol in Norway
Seestern - Norwegian, built in 1900 and too old for service, used for harbor patrol in Norway
Qualle - Norwegian, built in 1902 and too old for service, used for harbor patrol in Norway
Krokodil - Norwegian, built in 1902 and too old for service, used for harbor patrol in Norway

Total Available = 12. Possibly or Nearly Available = 6 Available, but operating in Norwegian waters = 19 (only four of which may have been useful)

U-Boot

At the beginning of August there were 18 U-Boot available and two new boats became operational. However, two were lost and two old boats were retired as training vessels, leaving 16 available at the beginning of September. Another three became operational in September giving a maximum of 19 available (and the strength did not change in October, one joined but one was lost, leaving 19 - see Clay Blair's two-volume history for additional details on the proposed operations). Total Available = 19, the total fleet was 51 strong end August, including those working up and training types, the start of war strength was 56, the low point 45 in April 1940. If all U-boats are assigned to the invasion it cuts the chances of stopping the US weapons arriving and frees RN anti submarine forces. If the idea is assign all the fleet then they have to be withdrawn from the trade routes in mid August at the latest to be ready. Also both sides were mining the channel, British mining had stopped U-boats using the route in 1939.

Support Vessels To provide fire support for the landings the Germans planned on using a number of ancient, captured vessels. They were:

Norwegian - Harald Harfarge (1897) and Tordenskjöld (1897), each 2 21cm, 6 12cm, 6 7.6cm, and 6 1-pdr guns, their machinery was still capable of 14 kt. They were converted to AA batteries and renamed Nymphe and Thetis.
Holland - Vlieereede (1902) and Ijmuiden (1906), one with one and one with two 24cm guns
Denmark - Niels Juel (1918, 10 15 cm and 15.9 kts)) and Peder Skram (1910, 2 24cm and 4 15cm)

The actual Seelöwe decision making timeline was:
27 August - Hitler decides on the "Small Solution", i.e., a landing between Folkestone and Eastbourne (so about a 50 mile front) by 16. Armee and 9. Armee. The landing by 6. Armee is relegated to being a 'possible' follow on.
30 August - OKM reports that the naval forces cannot be ready for an operation starting 15 September and that the earliest possibility is 20 September.
3 September - Hitler declares 21 September as the beginning of the operation. It is noted later that weather conditions between 12 and 21 September keep the S-Boote out of the British sea lanes; it is unlikely that operations by the landing fleet could have been undertaken in such conditions.
17 September - Hitler announces that preparations were to continue, but that the operation was delayed until further notice.
26 September - Raeder clarifies that since it is impossible to keep the landing fleet concentrated in the exposed Channel ports, they will be held there until the middle of October and will then be dispersed. Hitler makes no comment or complaint.

If you check Jürgen Rohwer in "Chronik des Seekriegs", which is based upon the OKM KTB and other primary sources, you will find that by 17 September the following had been collected at the ports: 155 transports (700,000 BRT) (another 13 were on the way) 1,277 barges and lighters (another 698 were being prepared or were on the way) 471 tugs (another 49 were on the way) 1,161 motor vessels (another 439 were on the way)

Note first that the number actually available for Hitler's proposed M-Day was 3,064. Of course, that's counting all motor vessels, which included the Vorpostenboot - Patrol boats usually converted from fishing trawlers and armed typically with one or two 8.8cm, up to 9 2cm, and a number of MG, Räumboot - Mineclearing vessels converted from small fishing cutters and armed typically with three or four 2cm guns, Minensuchboot - Either purpose designed minesweepers of the 1935-class (M1-39), which were armed with one 10.5cm and 2 2cm guns, 4 depth charges, and could carry 30mines in a mine laying role or fishing trawler conversions, typically with one 8.8cm and one or two 2cm guns, as well as the Prähme (motorized barges), and straight motorboats - including 200 motorboats and 100 motorized sailing vessels with Transportflotte E's Schleppverbandverband 5, which made up the majority of the motorized vessels intended to move VIII. Armee-Korps of 9. Armee.

Effects of British Air Campaign on the Invasion Ports in September
14/15 September - 7 transports (13,177 BRT) and 2 freighters badly damaged
17 September - 1 freighter sunk, 1 minelayer and T11 damaged
19 September - T3 badly damaged
21 September - 9 steamers, 51 barges and 1 tug destroyed
Total Losses in September: Lost: 2 T-Boot, 12 transports, 51 barges, 4 tugs. Damaged: 9 transports, 163 barges, 1 tug. The numbers put out of action represented 14 percent of the transport fleet, 17 percent of the barge fleet, and 1 percent of the tugs.

Coastal Command was doing anti invasion duties in July, Bomber Command was not bombing the invasion fleet until September, its effort that month was. 216 day bomber sorties despatched. The 30 to Germany (on the 1st to the 8th) were 16 aircraft industry, 10 oil, 3 canals and 1 anti ship. The 186 sorties to occupied countries have 162 anti invasion, that is sorties against warships, merchant ships and ports. These comprised 32 to Belgium, 50 "Europe", 44 France and 36 Holland. Another 24 sorties were sent to airfields (4 Belgium, 10 France, 10 Holland). Sorties against airfields essentially ceased on 8 September, anti invasion sorties began on 9 September.

September, by night, of the 3,088 sorties despatched 1,221 were to Germany, 1,170 to France and 597 to Belgium, 73% of sorties attacked the primary targets while another 14% attacked secondary targets. Remarkably sorties attacking shipping or ports in occupied Europe only started on 2 September and that was 12 sorties to U-boat docks at Lorient, on the 5th 13 sorties were sent to E-boat docks at Boulogne, plus 3 sorties to attack barges at Delfzijl in Holland. It was not until 7 September sorties to Belgium, France and Holland became almost exclusively against ports and shipping, with a further 1,618 sorties despatched to the end of the month. Over 100 sorties per night were sent on the 14th, 15th, 16th, 17th and 19th. It means that of the 1,850 sorties sent to Belgium, France and Holland in September 1,682 were against invasion targets and 57 against airfields. Some 21 of the aircraft despatched to invasion targets were listed as missing, or around 1.25% compared with an overall night bomber loss rate of 1.68% for the month. The ports were certainly defended.
 
To expand on Mr Sinclair's work a little bit.
Norwegian ships.

Captured
TB Panther - ex- Odin.................1939...................632 tons.....................30kts, German service 1 102mm gun, 2-4 20mm two 533mm torpedo tubes.
TB Leopard - ex-Balder...............1939...................632 tons.....................30kts, German service 1 102mm gun, 2-4 20mm two 533mm torpedo tubes. incomplete at capture
TB Tiger --- ex- Tor.......................1939...................632 tons.....................30kts, German service 1 102mm gun, 2-4 20mm two 533mm torpedo tubes. incomplete at capture
TB Löwe ---ex-Gyller...................1939....................597 tons.....................30kts, Norwegian service 3 102mm gun, 1 40mm four 533mm torpedo tubes.
TB Troll - -- ex- Troll.....................1909....................540 tons....................27kts new........6 75mm guns and 3 457mm torpedo tubes as built, coal
TB Zack --- ex-Snogg..................1921...................198 tons......................24kts new.......2 75mm guns and 4 457 torpedo tubes as built, oil
TB Zick --- ex-Trygg (?) ..............1919...................198 tons......................24kts new.......2 75mm guns and 4 457 torpedo tubes as built, oil
KT1 --------ex-Kjell......................1912.....................94 tons......................25kts new.......1 76mm gun and 3 457 torpedo tubes as built, coal
NS28 -------""""...... unkown
Kürassier -ex-Blink........................1896.....................45 tons......................???kts new....... Patrol boat in 1931 coal
Tarantel -- ex-Brand.....................1899.....................84 tons......................???kts new....... Patrol boat in 1931 coal,
Balte ---???
Admiral Deinhard -???
Schlange - ex-Orn........................1903.....................70 tons......................???kts new....... coal,
Eidechse - Ex Lom.......................1905.....................70 tons.......................???kts new....... coal
Schildkröte - ex-Hvas class1898-1903.....64 tons.......................???kts new....... Patrol boat in 1931 coal, tubes removed and fitted for minesweeping
Seestern - --ex-Hvas class
Qualle ------ex-Hvas class
Krokodil - --ex-Hvas class

Information is from different volumes of Conway's and may not be accurate. please note that the displacement seems to have changed from full load to standard load (no fuel?) as in the last volume all ships are lighter.
To show how useful many of these ships would have been.
HNoMS_Kjell.jpg

The Kjell which was taken in service in 1912 and was used by the Germans as the KT1 in the above list. She had an interesting history including involvement anti-bootlegging partols in the 20s and in the Altmark incident. She was sunk by six Mosquito fighter bombers. and more.


Notable as her career was, she and anything smaller and older had no business trying to sail from Norway down to the English Channel and trying to take on even an armed trawler.
 
The British couldn't afford to lose a significant percentage of its fleet because they still had a worldwide empire to protect. And that is something that was always in the back of their mind.
The Royal Navy had 15 Battleships, over 60 Cruisers and over 180 Destroyers in 1940, the Kriegsmarine had all up just over 30 ships from what I can find, how would they have caused a significant loss let alone stop the RN doing whatever it wanted to do in the channel once the invasion ''fleet'', comprised mostly of river barges roped together and towed by the few powered craft they had at 6 knots passed the channel midpoint?, how will the Kriegsmarine, Luftwaffe, coastal shore batteries accurately target the RN ships causing them to suffer significant losses as they sweep through the ''invasion fleet'', comprising mostly river barges roped together and towed by the few powered craft they have at 6 knots without hitting their own craft?.
 
Let's not forget that there were to be multiple mine fields dropped to either side of the invasion sites, forming corridors.

I suppose after several British ships plowed into them, holes may have been formed to which they could get through.

Sort of like waves of Tommies assaulting the "wire" and eventually their comrades were able to get over by climing on the piles of bodies tangled in the wiring.
 
I suppose after several British ships plowed into them, holes may have been formed to which they could get through.
British had several hundred minesweepers (converted fishing boats) that had been practicing on airplane laid mines and U-boat laid mines for quite some time.

Laying mines from surface ships close the British shore (5-6 miles) may not be a job description that lead to long life. One 6 in shell into the mine storage?
And the minesweepers get work on the mines while the shore batteries take pot shots at whatever pathetic German ships show up to try and stop the minesweepers.
C5DdGpaWMAAZB6d.jpg

Nobody has ever explained where all the mines were supposed to come from and how they were going to lay 10s of thousands of mines in a short period of time.
It is not Calais to Dover, It it is trying to mine from near Ostend to North of Ramsgate and perhaps from Cherbourg to Isle of Wight.
And here is where the need to ram ships through minefields taking big losses goes poof.
The ships go down near the English coast, away from any dense minefield/s and/or with high speed sweeps out (alternate classes of British between wars British destroyers were fitted with minesweeping gear) and once past the mine field border move out into the channel and into the barge/raft traffic.

Unless the Germans try a surprise raid/attack in late June or July there is going to be several weeks of mine/counter mine activity going on. And here the British have a definite advantage. Go out and sweep at night and only in certain areas. When the time to raid happens, combat ships go through pre/cleared lanes (mostly). The Germans don't enough minelayers and small craft (trawlers and what not) to play this game.
 
I have a book about Sealion and it covers the mine lanes in the same way. It also notes that the RN would have easily
laid mines across the lane in front of the barges. Then there was the option for the RAF to drop mines behind the invasion barges, thus sealing them inside
a long box of mines - mostly of their own making.
 
Yeah, I think you can. Raeder and Doenitz weren't dummies. They would have known that the U-Boat force would have been critical to the success of the operation. The speed of the U-boats isn't a factor because the British are coming to THEM. They would have been out screening the invasion fleet and it is a simple calculation to figure out where the RN ships MUST be to engage the invasion fleet. If the RN is going to engage, they MUST present themselves as targets.

Having a Topp, or a Prien coming after me is not something I would have enjoyd.

Keep them down under water, burning battery juice. You can do that with trainer airplanes, MTBs, etc. Even surfaced, U-boats are relatively slow, and very vulnerable. Diving is their defense, but once they do that, they lose position on any RN force charging past.

Given the narrow, shallow, and constricted waters a barge-borne invasion must transit, U-boats would probably be hard-put to provide much meaningful defense against a RN riposte. And they provide no defense at all against bombers attacking said barges or tows. Their limited numbers in 1940 also spell a weakness in any such plan.
 
Keep them down under water, burning battery juice. You can do that with trainer airplanes, MTBs, etc. Even surfaced, U-boats are relatively slow, and very vulnerable. Diving is their defense, but once they do that, they lose position on any RN force charging past.

Given the narrow, shallow, and constricted waters a barge-borne invasion must transit, U-boats would probably be hard-put to provide much meaningful defense against a RN riposte. And they provide no defense at all against bombers attacking said barges or tows. Their limited numbers in 1940 also spell a weakness in any such plan.
Were it that easy they would have done so. They didn't.
 
Were it that easy they would have done so. They didn't.

They didn't have to. The Germans cancelled the invasion on their own. Their navy was stripped of fighting power, and their air force was beleaguered by BoB. The Heer was regrouping after the victory in France. The bottoms actually supposed to carry the troops across the Channel were being bombed nightly.

Sea Lion was never launched because the conditions for its success were never attained -- on sea and in the air. That was a decision made by the guys who actually knew what they were up against.
 
Were it that easy they would have done so. They didn't.
Nothing was ever black or white. It was always shades of grey.
If the air patrols were ineffective (and they were a lot less than the British hoped for) why did the Germans move more and more to the Western Approaches and then further away from land ?
And this was before all the fancy stuff of 1943.
The early air patrols made it harder for the U-Boats to do their jobs (sink ships) even if the early air patrols didn't sink very many U-boats.
People forget it wasn't really the aircraft's job to sink U-boats. The Aircraft's job was to help the ships get through and keep ship losses to a minimum. Actually sinking U-boats was a bonus.
If the aircraft could keep the boats underwater it restricted both their mobility and their vision (detection range).
 
They didn't have to. The Germans cancelled the invasion on their own. Their navy was stripped of fighting power, and their air force was beleaguered by BoB. The Heer was regrouping after the victory in France. The bottoms actually supposed to carry the troops across the Channel were being bombed nightly.

Sea Lion was never launched because the conditions for its success were never attained -- on sea and in the air. That was a decision made by the guys who actually knew what they were up against.
I'm talking about the tactic of simply doing it. U-boats were running rampant up until 1942. IIRC the most successful Coastal Command squadron sunk a total of 8 subs over the duration of the war. Sinking subs was not easy until 1944. And even then easy isn't a word that I would use loosely.
 
Nothing was ever black or white. It was always shades of grey.
If the air patrols were ineffective (and they were a lot less than the British hoped for) why did the Germans move more and more to the Western Approaches and then further away from land ?
And this was before all the fancy stuff of 1943.
The early air patrols made it harder for the U-Boats to do their jobs (sink ships) even if the early air patrols didn't sink very many U-boats.
People forget it wasn't really the aircraft's job to sink U-boats. The Aircraft's job was to help the ships get through and keep ship losses to a minimum. Actually sinking U-boats was a bonus.
If the aircraft could keep the boats underwater it restricted both their mobility and their vision (detection range).
Very true, but they didn't have that strategy worked out till after invasion time had passed.
 
Let's not forget that there were to be multiple mine fields dropped to either side of the invasion sites, forming corridors.

I suppose after several British ships plowed into them, holes may have been formed to which they could get through.

Sort of like waves of Tommies assaulting the "wire" and eventually their comrades were able to get over by climing on the piles of bodies tangled in the wiring.
And the Germans would lay these minefields without any intervention from the British side, what ships would the Germans use to lay the mines?. If we do this the enemy will do that and we will win, easy.
 
By comparison with the German Navy the Royal Navy had hundreds of minesweeper trawlers etc. scores of destroyers and cruisers and battleships coming out of their ears. Their task was to defend Britain. Were the Germans to launch Sealion the naval response would be more a bar brawl 'get 'im Kev' than a slow measured minimum operation. Swamp the invasion and accept the losses.

Equally the RAF planned to use up its second line aircraft and crews directly on the invasion. About 600 aircraft of variable age and capacity. A Fairey Gordon might not have a good chance against an interception by 109s but the Luftwaffe has the front line squadrons to cope with and can't knock them all down. My grandfather, in his third war, on the east coast by the BoB with his Hime Guard platoon already had 2x Vickers MMGs and SMLEs all round right on the coast with the locally key bridge mined ready to blow up and divide the coast to prevent vehicle movement across the coast.

Even were the invasion to successfully land past the Royal Navy it would have ground to a halt. Albeit with massive losses and damage all round but the British were playing to win and to fight unfairly and damn the consequences.
 

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