sentences:  The expedition was regarded by the Belgians as a complete success.Leopold used his influence and that of the British directors he had appointed to his companies to gain acceptance of the treaties signed to place Katanga securely in Leopold's realm, adding about half a million square kilometres to it (16 times the area of Belgium).Keeping it separate from the rest of the Free State, Leopold delegated the administration of Katanga to another of his companies, which set up on the northern and western shores of Lake Mweru.