Convoy HG76 sets sail from Gibraltar in December 1941 expecting a routine passage. Instead, it becomes a landmark clash in the Battle of the Atlantic. Hunted by U-boats and long-range bombers, the convoy faces relentless attacks in heavy seas. Escort Group Commander Frederick Johnny Walker leads with aggressive, innovative anti-submarine tactics, backed by improved radar, Hedgehog mortars, and long-range air cover. Across five brutal days the escorts strike backramming, depth-charging, and destroying multiple U-boats. When HG76 finally reaches British waters, it has done more than survive: it proves the Allies can seize the initiative in the Atlantic.