Any scholarship that addresses the evolution of Christian perspectives on warfare generally references this book. first published in 1960. Although the scholarship of this work is now outdated and critiqued, Bainton's work is foundational in the area. Bainton believes that the Christian community started out pacifistic, then developed the just war doctrine, and finally adopted holy war ideals. He traces this trajectory from the Early Church up through the wars and conflicts of the 20th century. Finally, Bainton adds his critique of current militaristic ideas, especially in regards to atomic warfare.
(from a review by Andrew Lumpkin)