Joshua 8:24, 28-29

When the Israelite army finished chasing and killing all the men of Ai in the open fields, they went back and finished off everyone inside.

So Joshua burned the town of Ai, and it became a permanent mound of ruins, desolate to this very day. Joshua impaled the king of Ai on a sharpened pole and left him there until evening. At sunset the Israelites took down the body, as Joshua commanded, and threw it in front of the town gate. They piled a great heap of stones over him that can still be seen today.