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I've never even heard of anyone gaming those wars. We don't get much 18th Century gaming on this board. Sorry, beyond the odd paragraph describing the wars I know pretty much nothing about them.Look forward to hearing about it, should you come up with anything. Pics would be cool, too.
Those are both books worth having, but they don't cover the period you mentioned, unfortunately. The First and Second Cape Wars were fought between the Dutch and the locals in the 18th Century. The Brits weren't in South Africa at that time.
There are lots of possibilities. Xhosa ambush British wagon train, British/colonial troops sweep the bush for the Xhosa, Xhosa raid a frontier settler farm, British/colonial troops try to capture a Xhosa leader, British/colonial forces break out of a besieged frontier fort, etc etc Small-scale bush warfare stuff.
Have you thought of using Musket and Tomahawk rules? I have played a few games of Cape Wars using these rules and find they work really well with just a few period specific modifications.
I have no idea which issues, but there were a few articles on this in Wargames Illustrated and I believe in the early years. Don't know if there were scenarios included or only background information. And, of course, decades before the rules you are inquiring about.
I don't even own a copy of the rules. How would they compare to TMWWBK?