 He would later become chief of staff in the Armée de Libération Nationale (ALN), which was the armed wing of the Front de Libération Nationale (FLN), the main nationalist organization fighting French colonial control over Algeria.As chief of staff, Boumédiène entered into conflict with the FLN's government-in-exile, the GPRA, which towards the end of the war attempted to dismiss him.He then supported an alliance of FLN politicians against the GPRA's provisional post-independence government, and marched the ALN towards Algiers to occupy it.