Joshua 8:12

10Joshua rose up early in the morning, mustered the people, and went up, he and the elders of Israel, before the people to Ai.

11All the people, even the men of war who were with him, went up and came near, and came before the city and encamped on the north side of Ai. Now there was a valley between him and Ai.

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

13So they set the people, even all the army who was on the north of the city, and their ambush on the west of the city; and Joshua went that night into the middle of the valley.

14When the king of Ai saw it, they hurried and rose up early, and the men of the city went out against Israel to battle, he and all his people, at the time appointed, before the Arabah; but he didn’t know that there was an ambush against him behind the city.