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This source is part of a series of telegrams which President Roosevelt of the USA and Prime Minister Winston Churchill sent each other during the course of the Battle of the Atlantic.
Roosevelt and Churchill had a close relationship that probably helped effective cooperation in the battle.
During the Battle of the Atlantic German U-Boats and aircraft tried to cut off Britain’s supply lines across the Atlantic. The years 1941 and 1942 were the worst years in the Battle of the Atlantic. In 1941 the British and their Allies lost 1300 ships and in 1942 they lost 1661 ships. By late 1942 Britain was only able to import about one third of the goods it normally imported in peacetime.
The tide began to turn in 1943. At that time British code breakers were able to read many German naval signals. There were also effective new weapons against U-Boats such as depth charges.
One of the key elements in turning the tide against the U-boats was the development of long-range aircraft that could spot the U-boats using specially developed radar. These could direct escort ships to attack the U-boats or they could attack the U-boats themselves.
Another key factor was the development of the Liberty Ship. This was a ship built in US shipyards that could be built in a few months. By 1943 the US shipyards were producing more ships than the U-boats could sink.
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