They slew one another, either because they suspected treachery, and so fell upon those they first met with; which they might more easily do, because they consisted of several nations, as may be gathered from Judges 6:3, and Josephus affirms; or because the darkness of the night made them unable to distinguish friends from foes; or because the suddenness of the thing struck them with horror and amazement; or because God infatuated them, as he hath done many others. Compare 1 Samuel 14:20 2 Chronicles 20:23. Abel-meholah; of which see 1 Kings 4:12, 1 Kings 19:16.
Related Commentaries of Judges 7:22
Judges 7:22
22 And the three hundred blew the trumpets, and the LORD set every man's sword against his fellow, even throughout all the host: and the host fled to Bethshittah in Zererath, and to the border of Abelmeholah, unto Tabbath.