"This is the first comprehensive study of Gangraena, an intemperate anti-sectarian polemic written by a London Presbyterian Thomas Edwards and published in three parts in 1646. These books, which bitterly opposed any moves to religious toleration, were the most notorious and widely debated texts in a Revolution in which print was crucial to political mobilization. They have been equally important to later scholars who have continued the lively debate over the value of Gangraena as a source for the ideas and movements its author condemned. This study includes a thorough assessment of the usefulness of Edwards's work as a historical source, but goes beyond this to provide a wide-ranging discussion of the importance of Gangraena in its own right as a lively work of propaganda, crucial to Presbyterian campaigning in the mid-1640s."--Jacket.