Joshua 1:14

1:14 Your wives, children and cattle may stay in the land that Moses assigned to you east of the Jordan River. But all you warriors must cross over armed for battle ahead of your brothers. You must help them

Joshua 8:14

8:14 When the king of Ai saw Israel, he and his whole army quickly got up the next day and went out to fight Israel at the meeting place near the Arabah. But he did not realize men were hiding behind the city.