Massu's division to Algeria in response to a wave of armed attacks and terrorist bombings coordinated by Algerian FLN. Massu ultimately won the Battle of Algiers in 1957, during which French forces were able to identify and arrest the leadership of the FLN in Algiers through the successful application of coercive methods of interrogation and outright torture on members of subordinate cells. In July 1958, he was promoted to général de division and took the head of the army corps of Algiers, as well as functions of prefect for the region of Algiers.