Ahem, Zulus and native Americans= no match, they live in a different continent.
Zulus and British on the other hand could be a match, as the British had colonies over there in Africa.
That said, about your game, kinda reminds me of Rorke's drift:
http://www.mobygames.com/game/dos/rorkes-drift
If you ever saw the movie Zulu Dawn you'll know what the game is about.
But on the other hand I don't think Zulus had horses .....
Hmmmmm.
*
Walks away pondering about this game.....