Let them go — Successively at several times; and in divers places, so that they might not hinder one another, nor all run into the same field; but being dispersed in all parts, might spread the plague farther; and withal might be kept at a distance from the fields and vineyards of the Israelites.
Related Commentaries of Judges 15:5
Judges 15:5
5 And when he had set the brands on fire, he let them go into the standing corn of the Philistines, and burnt up both the shocks, and also the standing corn, with the vineyards and olives.