Joshua 8:20-22

20The men of Ai looked back and saw the smoke of the city rising up into the sky, but they had no chance to escape in any direction; the Israelites who had been fleeing toward the wilderness had turned back against their pursuers. 21For when Joshua and all Israel saw that the ambush had taken the city and that smoke was going up from it, they turned around and attacked the men of Ai. 22Those in the ambush also came out of the city against them, so that they were caught in the middle, with Israelites on both sides. Israel cut them down, leaving them neither survivors nor fugitives.