'Ambush' in the Bible
You shall do to Ai and her king as you did to Jericho and her king, except its spoil and its livestock, you shall take for a plunder for yourselves. Set an ambush for the city behind it."
He commanded them, saying, "Behold, you shall lie in ambush against the city, behind the city. Don't go very far from the city, but all of you be ready.
and you shall rise up from the ambush, and take possession of the city; for Yahweh your God will deliver it into your hand.
Joshua sent them out; and they went to set up the ambush, and stayed between Bethel and Ai, on the west side of Ai; but Joshua stayed among the people that night.
He took about five thousand men, and set them in ambush between Bethel and Ai, on the west side of the city.
So they set the people, even all the army who was on the north of the city, and their ambush on the west of the city; and Joshua went that night into the midst of the valley.
It happened, when the king of Ai saw it, that they hurried and rose up early, and the men of the city went out against Israel to battle, he and all his people, at the time appointed, before the Arabah; but he didn't know that there was an ambush against him behind the city.
The ambush arose quickly out of their place, and they ran as soon as he had stretched out his hand, and entered into the city, and took it. They hurried and set the city on fire.
When Joshua and all Israel saw that the ambush had taken the city, and that the smoke of the city ascended, then they turned again, and killed the men of Ai.