Judges 7:16-18

16He divided the 300 men into three 1companies, and he put trumpets and empty pitchers into the hands of all of them, with torches inside the pitchers. 17He said to them, “Look at me and do likewise. And behold, when I come to the outskirts of the camp, 2do as I do. 18When I and all who are with me blow the trumpet, then you also blow the trumpets all around the camp and say, ‘For the Lord and for Gideon.’”