The wolf pack method proved successful, for a time anyhow. As the battle wore on, the allies used advances in aircraft, escort carriers, sonar, and depth charge technologies to turn the tide in their favor in the Atlantic. By the last year of the war, German submarines were virtually useless, for the allies controlled the sea and the air both day and night. Losses among German U-boat crews, which amounted to 75% or higher, were the highest of any service on either side during the war.
Result: Allied victory
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