War
From Stoic Wiki
For since there are two ways of settling a dispute: first, by discussion; second; by physical force; and since the former is characteristic of man, the latter of the brute, we must resort to force only in case we may not avail ourselves of discussion. The only excuse, therefore, for going to war is that we may live in peace unharmed; and when the victory is won, we should spare those who have not been blood-thirsty and barbarous in their warfare.