He houghed their horses - The Hebrew word עקר akar, which we render to hough or hamstring, signifies to wound, cut, or lop off. It is very likely that it means here, not only an act by which they were rendered useless, but by which they were destroyed; as God had purposed that his people should not possess any cattle of this kind, that a warlike and enterprising spirit might not be cultivated among them; and that, when obliged to defend themselves and their country, they might be led to depend upon God for protection and victory. On the same ground, God had forbidden the kings of Israel to multiply horses, Deuteronomy 17:16 (note). See the note there containing the reasons on which this prohibition was founded.

Burnt their chariots - As these could have been of no use without the horses.

And Joshua did unto them as the Lord bade him,.... Namely, in the following instances:

he houghed their horses, and burnt their chariots with fire; not consulting his own worldly interest or that of the people of Israel, but the command of God, which he carefully obeyed, and reserved none for himself or them, as David in another case afterwards did; see 2 Samuel 8:4.

Joshua carried out the command of the Lord with regard to the chariots and horses.

And Joshua did unto them as the LORD bade him: he houghed their horses, and burnt their chariots with fire.

9. Joshua did unto them as the Lord bade him-(See Jos 11:6). Houghing the horses is done by cutting the sinews and arteries of their hinder legs, so that they not only become hopelessly lame, but bleed to death. The reasons for this special command were that the Lord designed to lead the Israelites to trust in Him, not in military resources (Ps 20:7); to show that in the land of promise there was no use of horses; and, finally, to discourage their travelling as they were to be an agricultural, not a trading, people.

11:1-9 The wonders God wrought for the Israelites were to encourage them to act vigorously themselves. Thus the war against Satan's kingdom, carried on by preaching the gospel, was at first forwarded by miracles; but being fully proved to be of God, we are now left to the Divine grace in the usual course, in the use of the sword of the Spirit. God encouraged Joshua. Fresh dangers and difficulties make it necessary to seek fresh supports from the word of God, which we have nigh unto us for use in every time of need. God proportions our trials to our strength, and our strength to our trials. Joshua's obedience in destroying the horses and chariots, shows his self-denial in compliance with God's command. The possession of things on which the carnal heart is prone to depend, is hurtful to the life of faith, and the walk with God; therefore it is better to be without worldly advantages, than to have the soul endangered by them.