Black May: The Epic Story of the Allies' Defeat of the German U-Boats in May 1943

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This book looks at the Battle of the Atlantic up to the decisive month when the Germans accepted that allied defenses were so good and numerous that their U-Boats could not affect the strategic outcome in the upcoming battle for Europe. This book draws upon primary sources, Allied and German.

Bonus! The book also looks at allied air power and its place in the campaign. The evolution of tactics and and adoption of technology.