How did the allies finally fight back against German A-boats?

The Allies fought back against German U-boats through a combination of tactics, including improved convoy systems, enhanced anti-submarine warfare technology, and the development of long-range aircraft for aerial reconnaissance and attacks. The introduction of depth charges, sonar (ASDIC), and the use of escort ships helped protect merchant vessels by detecting and engaging U-boats more effectively. Additionally, the breaking of German naval codes provided crucial intelligence that allowed Allied forces to anticipate U-boat movements, significantly reducing their effectiveness. These strategies collectively turned the tide in the Battle of the Atlantic, ensuring safer passage for Allied supply lines.