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| | U-boat - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-30) |
 | | With the United States already on the side of the Allies, Germany announced on 31 January 1917 that its U-boats would engage in unrestricted submarine warfare. |
 | | World War II During World War II, U-boat warfare was the major component of the Battle of the Atlantic, which lasted the duration of the war. |
 | | Advances in convoy tactics, radar, sonar (called Asdic in England), depth charges, the cracking of the German Enigma code, the introduction of the Leigh Light and the range of escort aircraft turned the tide against the U-boats. |
| www.kernersville.us /project/wikipedia/index.php/U-boats (584 words) |
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