So Gideon, and the hundred men who were with him, came to the outermost part of the camp in the beginning of the middle watch, when they had but newly set the watch: and they blew the trumpets, and broke in pieces the pitchers that were in their hands.
"And they stood every man in his place round about the camp"  (Judges 7:21).  These men were NOT using their swords at all; they were blowing their trumpets with all their might.  They continued to blow the trumpets, and added to the noise resulting from the panic in the enemy's camp, their terror and confusion were augmented and compounded.