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Pieces of a German torpedo run aground on the beach at St Yvon near Gaspé in 1942

Caption: Pieces of a German torpedo run aground on the beach at St Yvon near Gaspé in 1942

Several waves of German submarines were sent to North American waters in 1942 in response to the American entry into World War Two. The Germans found a fruitful hunting ground in the Gulf of St. Lawrence, where seven U-boats sank two dozen ships in 1942 alone. The crisis lasted until September of 1943, when improved training and a breakthrough in decrypting German codes allowed the defenders to gain the upper hand. (Musée de la Gaspésie, Gaspé, Quebec)