 According to them the Kinga are warriors who were good enough to fight with in the Konde Revolt against the Germans, and are eager to acquire Kinga iron implements in exchange for food, cattles etc.The Nyakyusa considered iron a scarce and precious commodity normally needing the secret skills of the Kinga smiths.With the invasion of the Ngoni the Nyakyusa found their wood-tipped spears to be ineffective against tough shields and went to the Kinga for well-made iron-tipped spears.