Joshua 8:7, 9, 12, 14, 19

Then ye shall rise up from the ambush, and seize upon the city: for the LORD your God will deliver it into your hand.

Joshua therefore sent them forth: and they went to lie in ambush, and abode between Beth-el and Ai, on the west side of Ai: but Joshua lodged that night among the people.

And he took about five thousand men, and set them to lie in ambush between Beth-el and Ai, on the west side of the city.

And it came to pass, when the king of Ai saw it, that they hasted and rose up early, and the men of the city went out against Israel to battle, he and all his people, at a time appointed, before the plain; but he wist not that there were liers in ambush against him behind the city.

And the ambush arose quickly out of their place, and they ran as soon as he had stretched out his hand: and they entered into the city, and took it, and hasted and set the city on fire.