The quote is an example of a personification because Personification is a literary device that writers use to give human qualities or attitudes to inanimate things.
Explanation:
The sentence “It was evident that their battle cry was “conquer or die”. is not referring to cry as the action of a human in moment of sorrow but to a shout to express what they want, then the sentence puts war in the position of a human as a way to express what that cry means which is "conquer or die" war represents an invisible being that talks this.
