 When it commenced on Easter Monday 1916, Collins served as Joseph Plunkett's aide-de-camp at the rebellion's headquarters in the General Post Office (GPO) in Dublin.There he fought alongside Patrick Pearse, James Connolly, and other members of the Rising leadership.The Rising was put down after six days, but the insurgents achieved their goal of holding their positions for the minimum time required to justify a claim to independence under international criteria.