Who said "The enemy without and the enemy within."?

This quote is attributed to Napoleon.

The enemy without and the enemy within. - Napoleon

"The enemy without and the enemy within."

Napoleon War

Character in Animal Farm

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"The traitor Snowball"

"Do not imagine that leadership is a pleasure"

"Snowball had plotted with Jones all along"

"We must be vigilant against our enemies"

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."