Joshua 8:1-3

Now the Lord said to Joshua, “Do not fear or be dismayed. Take all the people of war with you. Arise, go up to Ai; see, I have handed over to you the king of Ai, his people, his city, and his land.

You shall do to Ai and its king just as you did to Jericho and its king; you shall take only its spoils and its cattle as plunder for yourselves. Set an ambush for the city behind it.”

So Joshua rose up with all the people of war to go up to Ai; and Joshua chose thirty thousand men, valiant warriors, and sent them out at night.