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The story of the U-Boat Wargamers | Sky HISTORY TV Channel
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BBC - Liverpool - History - The last U-Boat
The Wargame That Revealed a Nazi U-Boat Tactic | Time
THE WESTERN APPROACHES TACTICAL UNIT, WHERE THE PROBLEMS OF ANTI-U-BOAT WARFARE ARE FOUGHT OUT. 18 MARCH 1945, DERBY HOUSE, LIVERPOOL. AT A ONE WEEK TACTICAL COURSE, COMMANDING, AND OTHER OFFICERS OF BRITISH