US Destroyers Vs German U-Boats : Osprey Publishing : 9781472854100 : 1472854101 : 27 Apr 2023 : An absorbing study of the duels fought between the US Navy's escort warships and Hitler's U-boats between December 1941 and May 1945. Although the Battle of the Atlantic lasted several years, its most critical phase began once the United States entered World War II. By December 1941, the British had mastered the U-boat threat in the Eastern Atlantic, only to see the front abruptly expand to regions the US Navy would patrol, chiefly the Atlantic Seaboard. Unless the US Navy overcame the U-boat threat, the Allies would struggle to win. The Battle of the Atlantic was made up of thousands of individual duels: aircraft against U-boats, aircraft against aircraft, aircraft against ships-but most crucially, ships against U-boats. The individual clashes between Germany's U-boats and the Allied warships escorting the vital convoys often comprised one-on-one actions. These stories provide the focus