Then ye shall rise up from the ambush,.... When they should see a signal made, that in Jos 8:18; and when their watch, they might set in a proper place, should see Israel flee, and the men of Ai at a distance from their city, pursuing, and give notice of it to the ambush: and seize upon the city; enter into it, and take possession of it, its fortresses, and secure its passes: for the Lord your God will deliver it into your hand; Joshua expresses himself with great confidence, having the promise of God, and relying on it.