Judges 7:15,16

When Gideon heard, he worshipped He praised God for this special encouragement. He divided the men into three companies To make a show of a vast army. Lamps within the pitchers The lights were put into the pitchers, partly to preserve them from the wind and weather, and partly that their approach to the Midianites not being discovered, they might surprise them with sudden flashes of light. But when every man had taken his post just on the outside of the camp, then they broke the pitchers, that they might have the advantage of the lamps, and at the same time cast a great terror upon the Midianites; who, from the number of the lights in different places, doubtless concluded that they were surrounded by a numerous army; and to this terror the number of trumpets, (each man sounding one,) and the shouts from different parts, greatly contributed.