Yes, that wiki page on the 2nd Boer War is rather intense.
Did your great uncle's service record list any clasps after his medal? One useful thing I learnt was that you can tell the battles a soldier was involved with (or was in the general vicinity of) by the
name of the clasps he received . The last two links I posted are useful for information on the battles/clasps and the third wiki link describes some of these battles/engagements.
If not, you may be able to find information specific to the RAMC and the Boer war on the Internet.
A thought just occurred to me. Perhaps your gt. uncle (who was in the medical corp.) treated my ancestor, who was wounded in one of the battles.
Anyway, I'm digressing! Good luck with the research.