Or, they from heaven, or the heavenly host fought, by thunder, and lightning, and hailstones, possibly mingled with fire. Compare Joshua 10:11 1 Samuel 7:10. The stars; which raised those storms by their influences, which they do naturally and ordinarily, but now far more, when God sharpened their influences, and disposed the air to receive and improve their impressions. In their courses, or, from their paths, or stations, or high places. As soldiers fight in their ranks and places assigned them, so did these, and that with advantage, as those enemies do which fight from the higher ground.
Related Commentaries of Judges 5:20
Judges 5:20
20 They fought from heaven; the stars in their coursesh fought against Sisera.