I've seen some discussions about the command of "fire" before gunpowder was invented. That may be "shoot", "loose", "throw" etc. But what was the command of "fire at will"? Are there any clues?
Update: "Fire at will" is a tactic which has long existed in history. After the invention of gunpowder, we call it "fire at will". Before gunpowder, what did we call this tactic? Was there a common used phrase or not?