Following France's armistice with the Axis powers, Great Britain realized that if Germany or Italy insisted upon the transfer of battleships, cruisers, and destroyers from the French Navy to the control of their own navies, the balance in the Mediterranean would immediately swing in their favour. Churchill decided that the Marine Nationale's most powerful vessels would need to be secured through diplomacy, coercion, or force. The French Navy commander-in-chief was equally eager to keep their ships out of Axis hands, but he also did not want the British to have them. These increasingly hostile circumstances led to Operation Catapult, which began on 3 July 1940, and saw the two nations battle for the ships.

Expert naval historian Ryan Noppen analyses the Royal Navy Operation Catapult at Mers el-Kébir, the follow-up Operation Lever and the French retaliatory actions in the subsequent days. This book examines the rapid deterioration of Anglo-French relations and how the two former allies quickly fell into armed conflict. Fully illustrated with detailed maps, photographs and artwork that bring to life the British and French forces involved, it presents an engaging treatment of an often-forgotten episode early in World War II.