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War with Arab slavers

In the short term, the third problem, that of the African and Arab slavers like Zanzibari / Swahili strongman Tippu Tip (actually Ḥamad ibn Muḥammad ibn Jumʿah ibn Rajab ibn Muḥammad ibn Saʿīd al Murjabī, but much better known by his nickname) was temporarily solved.

Initially the authority of the Congo Free State was relatively weak in the eastern regions of the Congo. In early 1887, Henry Morton Stanley had therefore proposed that Tippu Tip be made governor (wali) of the Stanley Falls District. Both Leopold II and Barghash bin Said of Zanzibar agreed and on 24 February 1887, Tippu Tip accepted.

In the longer term this alliance was indefensible at home and abroad. Leopold II was heavily criticized by the European public opinion for his dealings with Tippu Tip. In Belgium, the Belgian Anti-Slavery Society was founded in 1888, mainly by Catholic intellectuals led by Count Hippolyte d'Ursel, aimed at abolishing the Arab slave trade. Furthermore, Tippu Tip and Leopold were commercial rivals. Every person that Tippu Tip hunted down and put into chattel slavery and every pound of ivory he exported to Zanzibar was a loss to Leopold II. This, and Leopold's humanitarian pledges to the Berlin Conference to end slavery, meant war was inevitable.

Open warfare broke out in late November 1892. Both sides fought by proxy, arming and leading the populations of the upper Congo forests in conflict. By early 1894 the Zanzibari/Swahili slavers were defeated in the eastern Congo region and the Congo Arab war came to an end.

The Belgians freed thousands of men, women and children slaves from Swaihili Arab slave owners and slave traders in Eastern Congo in 1886-1892, enlisted them in the militia Force Publique or turned them over as prisoners to allied local chiefs, who in turn gave them as laborers for the Belgian conscript workers; when Belgian Congo was established, chattel slavery was legally abolished in 1910, but prisoners were nevertheless conscripted as force laborers for both public and private work projects.