Without number — That is, so many that it was not easy to number them. And not in a regular army to engage, but in a confused swarm, to plunder the country. Yet Israel, being forsaken of God, had not spirit to make head against them; God fighting against them with those very terrors, with which otherwise he would have fought for them.
Related Commentaries of Judges 6:5
Judges 6:5
5 For they came up with their cattle and their tents, and they came as grasshoppers for multitude; for both they and their camels were without number: and they entered into the land to destroy it.