Joshua 8:11-13

11Then all the fighting men who were with him went up and advanced and arrived in front of the city, and camped on the north side of Ai. Now there was a ravine between them and Ai.

12And Joshua took about five thousand men and set them in ambush between Bethel and Ai, on the west side of the city.

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