Joshua 8:11-13

11And all the people, even the people of war that were with him, went up, and drew nigh, and came before the city, and pitched on the north side of Ai: now there was a valley between them and Ai.

12And he took about five thousand men, and set them to lie in ambush between Beth–el and Ai, on the west side of the city.1

13And when they had set the people, even all the host that was on the north of the city, and their liers in wait on the west of the city, Joshua went that night into the midst of the valley.2