This is a phenomenally good book. It's amazing just as an adventure story. When you add in its historical value, it really becomes something special. The day to day life of the war, the attitudes, the details, the food, the relationships, are all fascinating. Churchill is in there, as is Jan Smuts.
There are fascinating details: the Boer commandos are, essentially, anarchist in structure. You join any one you like, and leave if you've had enough. If you don't feel like attacking, you don't. If you're defeated, you disappear for a bit, then form another commando.
Also interesting: the Boer side includes German and Dutch fighters, which is to be expected, but also Irish, English and Jewish soldiers, all fighting against the British Empire.
Despite the brutality of the British, with their concentration camps and scorched earth policy, soldiers on both sides fight honourably, and when Boers are wounded, they leave them behind, because they know the British will care for them.
As a fight between rival colonialists, the racial politics is interesting too, with a tacit agreement that as this is a white man's war, the indigenous population should be left out of it. This is not adhered to, and the Black population suffered greatly.
Along with a few other essential primary sources, this is a really great read to understand something of how South Africa ended up the way it did.