Regarding the troops of the prince, fear is absolutely necessary to keep a large garrison united and a prince should not mind the thought of cruelty in that regard. For a prince who leads his own army, it is imperative for him to observe cruelty because that is the only way he can command his soldiers' absolute respect. Machiavelli compares two great military leaders: Hannibal and Scipio Africanus. Although Hannibal's army consisted of men of various races, they were never rebellious because they feared their leader. Machiavelli says this required "inhuman cruelty" which he refers to as a virtue. Scipio's men, on the other hand, were known for their mutiny and dissension, due to Scipio's "excessive mercy" – which was, however, a source of glory because he lived in a republic.