Case Study: Battle of the Atlantic Phase I, June 1939-April, 1943 –Convoy system, British codes broken –German wolf packs control of sea lanes increasing –Allies build quantitative strength, new technology –Air gap 800 miles – crucial factor Phase II May 1943-1945 –Crisis April-May 1943 -the tide turns –Allied quantitative and qualitative achievements –Air gap closed; convoys plus hunter-killer groups –Technological advances e.g.
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