Zulu's are african tribe, that were famous for their brave and disciplined warriors. They had working chain and command and tactics, and they ruled large parts of southern Africa. Anglo-zulu war was between zulu nation and British Imperium 1879.
British troops with modern weapons defeated zulus which were armed with shields and assegais (assegai = short spear, used mainly in close combat as a melee weapon). Zulus managed to gain some victories (mainly because british commanders underestimaded their tactics), but didnt have a chance to win the war. Nowadays zulus still remain one of the southern African tribes.
Personally I dont think OFP would be good platform for this kind of battles (hundreds or even thousands warriors with spears against professional army armed with bolt action rifles).