Joshua 8:20-29

The 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. For 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. Those 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. But they took the king of Ai alive and brought him to Joshua. When Israel had finished killing all the men of Ai in the fields and in the wilderness where they had chased them, and when every one of them had been put to the sword, all the Israelites returned to Ai and killed those who were in it. Twelve thousand men and women fell that day—all the people of Ai. For Joshua did not draw back the hand that held out his javelin until he had destroyed all who lived in Ai. But Israel did carry off for themselves the livestock and plunder of this city, as the LORD had instructed Joshua. So Joshua burned Ai and made it a permanent heap of ruins, a desolate place to this day. He impaled the body of the king of Ai on a pole and left it there until evening. At sunset, Joshua ordered them to take the body from the pole and throw it down at the entrance of the city gate. And they raised a large pile of rocks over it, which remains to this day.