I. It is a surprising destruction, and very sudden, that is here threatened. They were very secure, thought themselves strong for war and able to deal with the most powerful enemy (v. 14), and yet the calamity is near, and he is not able to keep it off, nor so much as to keep the enemy long in parley, for the affliction hastens fast (v. 16) and will soon come to a crisis. The enemy shall fly as an eagle, so swiftly, so strongly shall he come (v. 40), as an eagle flies upon his prey, and he shall spread his wings, the wings of his army, over Moab; he shall surround it, that none may escape. The strong-holds of Moab are taken by surprise (v. 41), so that all their strength stood them in no stead; and this made the hearts even of their mighty men to fail, for they had not time to recollect the considerations that might have animated them. It requires a more than ordinary degree of courage not to be afraid of sudden fear.