Joshua 8:2

And thou shalt do to Ai and her king as thou didst to Jericho
and her king
Burn the one and slay the other:

only the spoil thereof, and the cattle thereof, shall ye take for a
prey unto yourselves;
which they were not allowed to do at Jericho:

lay thee an ambush for the city behind it;
at the west side of it: some have called in question the lawfulness of the ambush, but, as this was appointed by the Lord, there is no room for it.