Joshua 8:8-12

Then it will be when you have seized the city, that you shall set the city on fire. You shall do it in accordance with the word of the Lord. See, I have commanded you.”

So Joshua sent them away, and they went to the place of ambush and remained between Bethel and Ai, on the west side of Ai; but Joshua spent that night among the people.

Now Joshua got up early in the morning and mustered the people, and he went up with the elders of Israel before the people to Ai.

Then all the people of war who were with him went up and approached, and arrived in front of the city; and they camped on the north side of Ai. And there was a valley between him and Ai.

Then he took about five thousand men and set them in ambush between Bethel and Ai, on the west side of the city.