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Today in World War II History—Apr. 28, 1943

Hedgehog, an anti-submarine mortar, on destroyer HMS Westcott, 1945, weapons used by escort ships in battle of convoy ONS-5 (Imperial War Museum)

Hedgehog, an anti-submarine mortar, on destroyer HMS Westcott, 1945, weapons used by escort ships in battle of convoy ONS-5 (Imperial War Museum)

75 Years Ago—Apr. 28, 1943: Allied Atlantic convoy ONS-5 begins battle with U-boats: by May 6, 6 U-boats and 13 Allied ships will be sunk; the battle is considered a crucial turning point in the Battle of the Atlantic.