a patrol group of 21 boats, code-named Leuthen, to renew the attack on the North Atlantic route.
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In September 1943 BdU had established the patrol line Leuthen of 21 U-boats south of Greenland; these were to intercept west-bound convoys as they were about to enter the Greenland Air Gap, where Allied aircraft were reckoned to be unable to operate due to the extreme range.
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Leuthen was disbanded, with 12 boats forming a new patrol line, Rossbach, joined by 9 boats from home bases to attack the next set of east-bound convoys.
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