Commentators explain that God orchestrates the enemy's defeat through a two-pronged strategy. First, He will "call for a sword," summoning external forces to attack the invaders. Second, He will cause internal chaos, turning "every man's sword... against his brother." This means the enemy's coalition army will fall into confusion and destroy itself from within, a tactic God has used before in biblical history, such as with the Midianites in Judges 7.