Joshua 8:20-22

When the men of Ai looked back, they saw the smoke of their city rising to the sky. Joshua and his men also saw the smoke and knew that the other Israelite soldiers had captured the city and had set it on fire. The army of Ai had no place to escape, so Joshua and his men turned on them and began killing them. The men who had taken the city came out and joined the battle, so the Israelites had them surrounded. Israel cut them down, leaving neither survivors nor fugitives.