Kommentar zu Schoftim 5:20

War was waged from heaven. The Holy One blessed is He, as well, dispatched His hosts against them. They, too, have no desire for any payment.

They fought from heaven: That is to say, even without them, however, Sisera fell. And it was as if they fought with him from the heavens, and as if the stars swerved from their paths and from the way of their trajectories and descended and fought with Sisera. But our Rabbis, may their memory be blessed, said (Pesachim 118b) that the stars heated up the armor (such that it was too hot to touch). So they went into the Kishon Rivor to cool [it] down, but the waters of the river washed them away.

They fought from heaven: So great was the victory in which Israel defeated Sisera's army that it was as if they fought with Sisera from the heavens.