Joshua 8:9

8:9 Joshua sent them away and they went to their hiding place west of Ai, between Bethel and Ai. Joshua spent that night with the army.

Joshua 8:12-13

8:12 He took five thousand men and set an ambush west of the city between Bethel and Ai. 8:13 The army was in position – the main army north of the city and the rear guard west of the city. That night Joshua went into the middle of the valley.