Joshua 8:3-9

Ver. 3-9. So Joshua arose, and all the people of war, &c.— Joshua first detached from his army thirty thousand men, and charged them to go in the night-time and lie in ambush on the west side of Ai, at a convenient distance; while, on his part, by break of day, he advanced with all his troops, and appeared before the town, in order to draw out from thence the garrison, which, doubtless, had no idea that the whole army followed. He then informed the officers who commanded the detachment, that, in this case, he would flee, in order to mislead the king of Ai; that then they were to quit their ambush on the signal which he should give them, (ver. 18.) enter Ai, set fire to some houses, to inform him of their success; and in all things punctually obey these instructions as orders delivered from God.