To harden their hearts — It was the design of God's providence not to soften their hearts to a compliance with the Israelites, but to give them up to their own animosity, pride, confidence and stubbornness; that so their abominable and incorrigible wickedness might be punished, and that the Israelites might not be mixed with them, but be entire among themselves in the possession of the land.
Related Commentaries of Joshua 11:20
Joshua 11:20
20 For it was of the LORD to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, and that they might have no favour, but that he might destroy them, as the LORD commanded Moses.