One of the key strategic points around Paris was Fort Issy, south of the city near the Porte de Versailles, which blocked the route of the Army into Paris. The fort's garrison was commanded by Leon Megy, a former mechanic and a militant Blanquist, who had been sentenced to 20 years hard labour for killing a policeman. After being freed he had led the takeover of the prefecture of Marseille by militant revolutionaries. When he came back to Paris, he was given the rank of colonel by the Central Committee of the National Guard, and the command of Fort Issy on 13 April.