The children of the east Probably the Ishmaelites, or Arabians, especially the eastern part of them. Unto Gaza That is, from the east, on which side they entered, to the west, where Gaza was, near the Mediterranean sea. So that they destroyed the whole land. 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 6:3
Judges 6:3-5
3 And so it was, when Israel had sown, that the Midianites came up, and the Amalekites, and the children of the east, even they came up against them;
4 And they encamped against them, and destroyed the increase of the earth, till thou come unto Gaza, and left no sustenance for Israel, neither sheep, nor ox, nor ass.
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.