War on the Saints is Jessie Penn-Lewis's masterwork, wherein she outlines the occurrences of Satan within the Christian world, and the eternal battle between good and evil. The book aims to prepare and assist Christians who are caught unguarded against the onslaught of evil and deception which has ensued for thousands of years. In so doing, the reader will - assuming they heed the advice upon these pages - be better equipped versus the various obstacles, trickery and evils that Satan and his ilk will hurl in the path of the righteous. Penn-Lewis firmly believed that the devil was a master manipulator, with a keen knowledge of when and who to target in his schemes. Several of the chapters within this book detail the different techniques employed by Satan, and how to guard against them. Quotations of Scripture abound, boosting the author's authority and lending much credence to her arguments.