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

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

Joshua therefore sent them out; and they went to lie in ambush, and stayed between Bethel and Ai, on the west side of Ai; but Joshua lodged that night among the people.

So he took about five thousand men and set them in ambush between Bethel and Ai, on the west side of the city.

Now it happened, when the king of Ai saw it, that the men of the city hurried and rose early and went out against Israel to battle, he and all his people, at an appointed place before the plain. But he did not know that there was an ambush against him behind the city.

So those in ambush arose quickly out of their place; they ran as soon as he had stretched out his hand, and they entered the city and took it, and hurried to set the city on fire.