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Its not on the list but I'll go for the defense or rather the lack of defense by the British at Singapore there was adequate men and equipment to have fought off the Japanese but the leadership and planning where appalling.
Then again, had they gone straight to Russia in spring/summer of 1940 instead of attacking Britain it may well have gone more sucessfully. (at the same time doing all they could to keep the US and UK out of the war in Europe for as long as possible. -including cutting ties with Japan or even declaring war on them after Pearl Harbor)
The French would have taken the opportunity to invade Germany which would have been disastrous for the Germans. Further more, I think the German Army was not really fit for attacking Russia in 1940 either, having to cover the vast distances.
This is the sort of thread that calls for long and informed posts.
What most people who study WW II don't fully appreciate is the Stalin and the Red Army had their backs to the wall in 1942. The tremendous production rate of the T-34 and Il-2 was not yet there in mid 42, much of the Red Army had shortages of equipment even down to the humble rifle, and Stalin's prestige in the Red Army and Communist Party had taken a tremendous whack.
A stunning German victory in 1942 could well and plausibly have triggered the collapse of both the Red Army and the Communist Party. And, despite the logistical nightmare that was Russia, it was possible for Hitler to have achieved his war aims in 1942 - if only he could make up his mind.
Caucasus? Or Stalingrad?
He should have gone for Stalingrad first. With Stalingrad taken, the physical and moral shock would have shattered the communist regime.
That is what happens when you let a corporal run one of the best armies in the history of the world. Blunder after blunder. In my opinion Stalingrad was not important enough strategically to lose over a million well trained and motivated troops. By splitting the Sixth Army the "little corporal" ensured if not defeat, a drawn out battle in urban settings. we know today from recent experience that this is worst type of terrain to assault and occupy. The Panzers and Stukas had no advantage in Stalingrad.
The Red's made a wise tactical decision and used barely enough resources to hold the Werhmacht in place while they built a huge battle group to encircle and starve out the Germans.
Paulus seemed shocked and indecisive about the encirclement. In my opinion he should have disobeyed orders and withdrwn to the southwest before December. Hauser did the same thing in Kharkov and saved his battle group and even won Kharkov back. Hauser had to endure the wrath of Hitler but his victory saved him.