They fought for King and Kaiser: South Africans in German East Africa 1916 by James Ambrose Brown.

At the start of the First World War, Germany posessed two African colonies south of the south of the equator, German West Africa (today Namibia) and German East Africa (today Tanzania). At the end of the war the two colonies had been conquered by South African generals. The German West Africa campaign had ended in surrender. The German East Africa campaign set the prototype for many of the African wars for the rest of the century: Black troops lead by white officers that know the country consistently outmaneuvre the invading foreign army. Casualties from disease is far greater than casualties from enemy action.

The two great protagonists in the story are General Smuts on the South African side, and Colonel von Lettow-Vorbeck.