In the past opponents in East Africa, apart from those students from the "Heixinggen Military Academy" who participated in the Prussia War, had basically not encountered line infantry tactics.
The Portuguese had the capability, but during the last East-Portuguese War, Portugal wished they had two soldiers for every one, with too few colonial troops, and the Black servant army didn't have such capabilities.
Line infantry tactics are not something every army can play; firstly, the army needs strong coordination, and secondly, extraordinary courage.
And neither of these traits were present in the Black servant army hastily organized by the Portuguese; instead, during previous conflicts between East Africa and the Ndebele Kingdom, the Ndebele people used a "semi-finished" line infantry tactic.
