 In 1955, he carried the weapon to become the "Commander Slimane" in the Area 8 of the Wialya 5 along with Colonel Lotfi, Then becoming a member of the General Staff of the ALN alongside Colonels Boussouf, Othman including Boumediène Chief of Staff of which he became a close.in 1961 he was one of the ALN representatives in the talks and the negotiations with France, which led to 'ceasefire' and the signing of Evian agreements.During the war of national liberation, Si Slimane participate actively in structuring the FLN organization and the supply of weapons of the ALN.