This chapter summarizes the course of events during the civil war. It is divided into three parts. Part one documents the efforts made to keep the IRA united and prevent the Treaty split resulting in civil war, which resulted in the making of the Collins de Valera electoral pact in the spring of 1922. Part two describes the conventional fighting between June and September. Part three explores the guerrilla phase and the executions which accompanied it. The significance of the death of Michael Collins is discussed, as is the formation of a Republican Government on the anti-Treaty side. The disintegration of republican military opposition in 1923 is chronicled, and the one-sided outcome to the fighting was attributed to the unequal distribution of power resources between the two sides.