The First Hours of D-Day on Omaha Beach
[Excerpted from Omaha Beachhead (6 June-13 June 1944) American Forces in Action Series. Historical Division. War Department (Washington, D.C.: Center of Military History, Facsimile Reprint, 1984), pp. 35-87]
D Day: The Landings
THE SELECTION OF D DAY was governed by several factors, complicated by the need of satisfying Allied requirements in five different landing areas, each with its own problems. It was desirable that D Day fall during a period when the days were long, for maximum use of Allied air power; when the moon was near the full, for better maneuver of ships and for easier night landings of airborne troops; and when tides were strong, so that beach obstacles would be fully exposed at low water and the landing craft could be floated far up the beach for convenient unloading at high water. Further, D Day must be selected with reference to certain requirements for H Hour, the moment when the first assault units touched down on the beaches. These were: that there be an hour of daylight before H Hour so that the preliminary bombardment would be as accurate as possible, and landing craft could be more easily organized into formation for the assault; that the tide should be near half-flood, so that obstacles would still be exposed, but rock ledges near the shore in the British one would not be dangerous; and that the tide be rising at H Hour, insuring two high tides during daylight to facilitate maximum unloading of supplies. Certain groups of days came nearest to satisfying all these requirements: 21-22-23 May, 5-6-7 June, and 19-20-21 June were closest to the target date of 1 June. On 8 May, D Day was fixed at 5 June.
V Corps units had been alerted on 23 March to be ready for movement to marshaling areas on short notice. Actually, movement began 7 May and was completed by 11 May for elements of the assault and follow-up forces ("O" and "B"). The pre-embarkment handling of 65,000 men and 7,600 vehicles was accomplished by the XVIII and XIX Districts of the Southern Base Section, Services of Supply. Once in the marshaling areas, troops were "sealed" in their camps, given final items of equipment, and thoroughly briefed on all phases of their assignments. During the last few days of May, they were moved from the marshaling points to the ports and "hards" [1] for embarkation, their places being immediately taken by units designated to follow across the Channel in build-up schedules. By 3 June all troops of Force "O" had been loaded, and some of them had been aboard several days. Portland, Weymouth, and Poole were the embarkation areas. On the night of 27 May, a small enemy air attack on the Weymouth area caused some losses of a few smaller craft by mines. Aside from this raid, the loadings suffered no interference from enemy action, and German air reconnaissance up to D Day was on a routine scale.
The story of the Navy's share in operation NEPTUNE must be told elsewhere. Western Task Force, commanded by Rear Adm. Alan G. Kirk, was responsible for the embarkation and landing of First U. S. Army forces. Rear Adm. J. L. Hall, Jr., commanded Force "O," which would carry the assault against Omaha Beach. The magnitude and complexity of the movement may be suggested by figures. To lift and land this initial assault force of 34,000 men and 3,300 vehicles required 7 transports, 8 LSI's, 24 LST's, 33 LCI (L)'s, 36 LCM (3)'s, 147 LCT's, and 33 other craft, while the escort, gunfire support, and bombardment missions employed 2 battleships, 3 cruisers, 12 destroyers, and 105 other ships. Force "O" also included 33 mine-sweepers and 585 vessels used in service work.
The 16th RCT, including 3,502 men and 295 vehicles attached only for movement to the beach, numbered 9,828 personnel, 919 vehicles, and 48 tanks. To handle this one unit required 2 transports, 6 LST's, 53 LCT's (of various types), and 5 LCI (L)'s; small craft, to be launched from the larger ships in the transport area, included 81 LCVP's, 18 LCA's (British), 13 other landing craft, and about 64 dukws.
The assault of this armada was dependent on the weather, which could so easily influence both naval and air operations. At the last minute, with all assault forces loaded and waiting for the signal to start, Operation NEPTUNE was threatened with checkmate. On 3 June, his meteorological staff gave General Eisenhower an unfavorable forecast for D Day, predicting overcast skies and strong winds. At 0415 on 4 June he decided to postpone D Day 24 hours. One of the divisions of the assault convoy had already started out to sea, according to schedule, and had to be recalled.
Weather forecasts on 4 June held out hopes for a slight but temporary improvement. Beginning on 5 June and lasting about 24 hours, there would be an interval of better sky conditions, with broken clouds at a ceiling not lower than 3,000 feet. Seas were expected to moderate. Following this break, the prospects were for renewed cloud and stronger winds. Postponement to 7 June would therefore risk a deterioration of weather conditions, as well as fueling difficulties for some of the ships in convoys already at sea; further postponement would mean a delay until 19 June before tide and moon conditions were again suitable. General Eisenhower decided at 0415 on 5 June to accept the risks involved in making the assault under the conditions of sea and sky expected for the next day. H Hour for Omaha Beach was set at 0630. [2] Low tide would occur at 0525 and the first high water 1100. Sunrise was at 0558 and sunset 2207.
The main convoy of Force "O" cleared Portland Harbor on the afternoon of 5 June; movement across 100 miles of channel to the assault area was uneventful. The operation met no interference from action by enemy naval or air forces. Continuous air cover was provided for the shipping lane and for the Allied assault beaches. Spitfires protected the convoys at low altitudes; patrols of four squadrons of P-47's from the Ninth and Eighth Air Forces were over the shipping lane and its flanks at all times.
The assault beach ones were to receive continuous cover by fighters, the Ninth Air Force detailing five groups for high cover, with the task of maintaining three squadrons over the Allied beaches at all times during daylight. Low cover was a British commitment. One of the most important contributions to the whole operation was performed by the sweepers of Western Task Force, which made possible the passage of the convoys to the assault beaches without loss from mines. The Ancon, headquarters ship for Admiral Hall and General Gerow, anchored at 0251 on D Day in the transport area, 23,000 yards off Omaha Beach.
In spite of some improvement over the previous period, weather conditions were far from ideal for the assault operations. Visibility was 10 miles, but there was a partial overcast to hamper bombing. The wind was still strong, coming from the northwest and therefore producing its full effects on the coastal waters off the Omaha sector. A wind force of 10 to 18 knots caused waves averaging 3 to 4 feet high in the transport area, with occasional waves up to 6 feet. On the beach, breakers were 3 to 4 feet. This condition of the sea persisted well into D+1 before the wind moderated. The effect on the landing plans was to be felt throughout D Day.
Approach to the Beach
The movement from transport area to shore proceeded according to a complex schedule, involving hundreds of craft and requiring the nicest timing to get the assault elements to the shore in their appointed order. One of the first steps was the loading of the assault infantry units from their transports into the small LCVP's and LCA's, which were launched from the larger mother ships. The process began three to four hours before Hour and was rendered difficult by the choppy seas, which caused some minor delays. Carrying the early waves of 116th assault troops, the transport Thomas Jefferson was able to unload all its craft in 66 minutes, aided by the fact that 25 of the 33 craft could be "railloaded" and then swung overside. The Thomas Jefferson craft left the rendezvous area at 0430, 25 minutes ahead of schedule, since control officers feared the conditions of sea would delay the approach run.
More serious effects of the rough seas were felt as the smaller craft moved in through the rendezvous area to the line of departure. The LCVP's and LCA's were drenched with spray from the start, and most of them began to ship enough water to demand full use of the pumps. In a good many craft the pumps would not carry the load, and the assault troops had to bail with their helmets. Craft having pump troubles were likely to be slowed down, and any attempt to raise the speed and catch up resulted in shipping more water than before. Only a small minority of the craft were in serious difficulties. Out of 180 to 200 craft used for the two assault RCT's, 10 carrying infantry are definitely known to have swamped, some almost at the start and others near the beach. Nearly all personnel from the swamped craft were rescued by naval craft or passing ships, often after hours in the water.