Judges 7:10-12

But if thou fear to go down, go thou with Purah thy servant down to the camp: and thou shalt hear what they say; and afterward shall thy hands be strengthened to go down into the camp. Then went he down with Purah his servant unto the outermost part of the armed men that were in the camp. And the Midianites and the Amalekites and all the children of the east lay along in the valley like locusts for multitude; and their camels were without number, as the sand which is upon the sea-shore for multitude.