Joshua 8:9-12
English Standard Version
10Joshua arose early in the morning and mustered the people and went up, he and the elders of Israel, before the people to Ai.
11And all the fighting men who were with him went up and drew near before the city and encamped on the north side of Ai, with a ravine between them and Ai.
12He took about 5,000 men and set them in ambush between Bethel and Ai, to the west of the city.