Joshua 8:20 in the King James Version
And when the men of Ai looked behind them, they saw, and, behold, the smoke of the city ascended up to heaven, and they had no power to flee this way or that way: and the people that fled to the wilderness turned back upon the pursuers.
Context
19 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.
20 When the men of Ai looked behind them, they saw, and behold, the smoke of the city ascended up to heaven, and they had no power to flee this way or that way. The people who fled to the wilderness turned back on the pursuers.
21 When Joshua and all Israel saw that the ambush had taken the city, and that the smoke of the city ascended, then they turned back and killed the men of Ai.