Battle of the St. Lawrence
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The Battle of the St. Lawrence involved marine and anti-submarine actions throughout the lower St. Lawrence River and the entire Gulf of Saint Lawrence, Strait of Belle Isle, Anticosti Island and Cabot Strait from May–October 1942, September 1943,... Wikipedia
Start date: May 1942
End date: November 1944
Location: Saint Lawrence River, Gulf of Saint Lawrence, and Strait of Belle Isle