Joshua 11

Joshua 11:13

But as for the cities that stood still in their strength, Israel burnt none of them.

As for those cities, which yielded themselves up to Joshua, ere they were defaced by a violence of a siege, Israel burnt none of them.

Joshua 11:20

For it was of the LORD to harden their hearts, that they should come against Israel in battle.

It was the wise counsel and just decree of the Almighty, that the inhabitants, being left to their own thoughts, should take up stubborn resolutions to stand out in battle against Israel.