The Battle of Madagascar (5 May – 6 November 1942) was an Allied campaign to capture the Vichy French−controlled island Madagascar during World War II. The seizure of the island by the British was to deny Madagascar's ports to the Imperial Japanese Navy and to prevent the loss or impairment of the Allied shipping routes to India, Australia and Southeast Asia. It began with Operation Ironclad, the seizure of the port of Diego-Suarez (now Antsiranana) near the northern tip of the island, on 5 May 1942.
A campaign to secure the rest of the island, Operations Stream, Line and Jane, was opened on 10 September. The Allies broke into the interior, linking up with forces on the coast and secured the island by the end of October. Fighting ceased and an armistice was granted on 6 November.