Interesting bit of history Chris. That link speaks of Silkaatsnek and the landmark "Wagboom". I looked for years to try and find the site of Mzilikazi's settlement - the reason for the name "Silkaats" - and only after a bad fire one year I found it not at Silkaatsnek where I was looking, but at the main Hartbees poort. It was extensive in size and very well located for its defence.
I will get a picture next time I am up there.