Joshua 8:18-19

18Then the Lord said to Joshua, “Stretch out the spear that is in your hand toward Ai, for I will give it into your hand.” And Joshua stretched out the spear that was in his hand toward the city.

19So those in ambush arose quickly out of their place; they ran as soon as he had stretched out his hand, and they entered the city and took it, and hurried to set the city on fire.