This volume is a systematic study of the politics of five crucial years of the Puritan Revolution, the period between John Pym's death in December 1643 and the execution of Charles I in January 1649. MacCormack examines the Long Parliament and the structures of its parties. He investigates the degree to which the division between parties was religious or political, the character of the leadership of the two major groups, and the transformation of the parties during the five-year period.