Just as a matter of interest, and considering that both Sikhs and Gurkhas (and Scots and Irish, but that's another story) were allowed or encouraged to serve in the armies of the British State and Empire, why wasn't there any similar attempt to get the Zulus roped in as well? Had policy changed between the 1840s and the 1880s, or did they defeat the Brits just TOO convincingly at Isandhlwana?