Battle of the Atlantic

The Battle of the Atlantic was fought across the shipping routes that supplied Britain and later supported Allied operations in Europe. German U-boats, aircraft and surface raiders threatened merchant convoys, while Allied escorts, aircraft, radar, intelligence and shipbuilding tried to keep the routes open.

The campaign mattered because Britain’s survival and Allied offensive capacity depended on maritime supply. Codebreaking, convoy tactics and technological adaptation were as important as individual sea battles.

Robert Harris’s Enigma connects Bletchley Park codebreaking to the convoy war. The context suits fiction about naval intelligence, U-boat threat, merchant seamen, secrecy, signals, weather, escort groups and the pressure of invisible war at sea.