The individual battle that made the rifle famous was the Battle of Rhourks Drift. It was an British Engineer unit building a bridge. I believe that the British numbered around 200 and the Zulu's in the thousands I've heard 2 to 5 thousand. The movie is actually quite good IMHO. They won that battle, and another unit was wiped out prior to the battle at Rhourks Drift, but can't remember that battle (massacre).
Nice Rifle by the way. How is the barrel? Have you had the barrel slugged to determine the specific caliber that you have?