Almost forgot:

Journal of the Royal United Service Institution (1867), p. 256:

"Something that is placed at a considerable distance from the friendly fire, the fire of the gun itself."


Journal of the Military Service Institution of the United States (May, 1910):

"What have we done to avoid their being shot to pieces by friendly fire? Absolutely nothing that we have ever heard of -- and yet this is one of the most serious problems that confronts the leader of troops. Courage before the enemy will quail before a fire from the rear."