Joshua 8:11-13

11Then all the people of war who were with him went up and drew near and arrived in front of the city, and camped on the north side of Ai. Now there was a valley between him and Ai.

12And he took about 5,000 men and set them in ambush between 1Bethel and Ai, on the west side of the 2city.

13So they stationed the people, all the army that was on the north side of the city, and its rear guard on the west side of the city, and Joshua spent that night in the midst of the valley.