Joshua 8:23

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.

The others came out of the city against them, so they were in the midst of Israel, some on this side, and some on that side. They struck them, so that they let none of them remain or escape.

It happened, when Israel had made an end of killing all the inhabitants of Ai in the field, in the wilderness in which they pursued them, and they had all fallen by the edge of the sword, until they were consumed, that all Israel returned to Ai, and struck it with the edge of the sword.

All that fell that day, both of men and women, were twelve thousand, even all the men of Ai.