The main purpose of U-Boats should not have been to just clock up Tonnage but to cut off the supply lines to Britain. Thsi was never done. Throw a U-Boat cordon around the Western Approaches and you win the war. The Royal Navy took years to gain the necessary experience to combat the U-Boat.
Only 2% of ships in Convoy were sunk. 98% got through and delivered the cargos.
It wasn't all Donitz fault. The Luftwaffe chose to bomb London when it shoudl have concentrated on the British Docks and shipyards.
The bottom line is the Germans and Japs don't know how to win wars. :rotfl:
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