According to Mike Snook, by the 1840s, 75% of the Basotho fought as gun-armed mounted infantry. They preferred skirmishing and ambush, and did not go in for massed charges like the Zulu did. Unusually for this part of Africa they had lots of guns and lots of ponies. Their two wars against the Boers were in the 1850s and 1860s. There do not seem to have been any pitched battles, though.
The first war was characterized by ambushes and raids, both by Boers into Basutoland and Basotho raiding the farms of the Orange Free State. The Boers occassionally found themselves outgunned, something they would not often have experienced. Seems the Basotho were pretty terrible with their guns to begin with, but became more formidable in time. This seems like a conflict built for skirmish gaming.
The second war was more bloody and mainly consisted of the Boers trying to assault Basotho mountain-top fortresses. Not so much scope for the horsemen in this one, as the Basotho were mostly defending fortified positions with guns. The Boers are said to have deployed artillery in these assaults, and interestingly the Basotho had some cannons acquired from traders, but these were largely ineffective.
Neither side prevailed in either war, a peace was arbitrated by the British in both cases.
Edit: Ha! I said Chris Peers when I meant Mike Snook.
