Re: what are they doing?
"Sorry sarge, it got in my sights just as I was firing.."
The story I heard from my Grampy was that they would nominate some rocks as target practice, and then "discover" the mistake later. Or indeed the sheep was going for the throat, so I had to give it the bayonet....
These days I gather it's part of the training of young officers to explain to a surly Welshman that he's down one sheep, and sort out the appropriate amount of reimbursement-by-form and by brown envelope. Good practice for when you're trying to win hearts and minds.
They also do escape and evade occasionally, where the locals are supposed to not help the runners. The Welsh having the typical amount of respect that one expects for being told what to do by a rupert tend to cook up an extra fruitcake to give out.