They stood As if they had been torch-bearers to the several companies. Every man's sword against his fellow They slew one another, 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, because the darkness of the night made them unable to distinguish friends from foes, because the suddenness of the thing struck them with horror and amazement, and because God had infatuated them, as he had done many others.
Related Commentaries of Judges 7:21
Judges 7:21-22
21 And they stood every man in his place round about the camp: and all the host ran, and cried, and fled.
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.