Judges 3:27,28

He blew a trumpet In order to summon those who were disposed to recover their liberty to take arms and follow him. And the children of Israel went down with him Whom doubtless he had prepared by his emissaries, and gathered together in considerable numbers. With these he attacked the Moabites who were in garrisons on the west of Jordan, and slew ten thousand of their best men; which utterly broke the power of Moab, and freed the Israelites from the yoke of that nation. They took the fords of Jordan Where that river was usually passed, that neither the Moabites that were in Canaan might escape, nor any more Moabites come over Jordan to their succour.