The incident in the temple when Jesus used the scourge of small cords (John 2:13-17) is often cited as indicating Jesus sanction of war. The very most that can be said in this regard is that Jesus' sanctions the use of force. To say this is not proof that Jesus sanctions war War.... If Jesus had used force in such a way as to give supremacy to military necessity, to destroy human life, to break down reverence for personality, to retaliate with evil for evil, to compel the surrender of his moral freedom, we might then well believe that he sanctions war. The use of force is one problem, the morality of war as a means to an end involves so many additional factors as to be quite a different problem. Each should be judged on its own merits.

Ch.4 p. 62-63 - The Sword or the Cross, Which Should be the Weapon of the Christian Militant? (1921)