I found the following document in the war diary of the 87th/88th Field Battery, Royal Canadian Artillery. It appears to be about an rather unique practice session with scores for various groupings such as Bull, Inner, Outer, Magpie?, and Miss. I suppose it is obvious that a white disc in on the Shot Hole in a Bull, but waving a Red and White Flag across the target for a miss during the Butt Party? I guess you had to be there to understand what was going down.
At one end of a gallery range is the firing point from which the shooters engage the targets. At the other end are the stop butts, high banks of earth to stop the rounds once they have passed through the targets. In front of the targets is the Mantlet a covered walkway that allows soldiers to man the targets whilst undercover and indicate the fall of shot with flags and pointers. They also pasted up the targets after a practice had been fired These men are called "The Butt Party" Butts is an Old English name for a place set aside for the compulsory practice of archery in the middle ages, most towns or villages had one and this is reflected in some English place names such as Newington Butts in London.
