About 1880 it was running strongly, but about this time a gradual fall in the lake-level set in, and was continued, with occasional pauses, for some twenty years, the amount being estimated by Wissmann at 2 feet annually.
A small steamer, the " Good News," was placed on the lake by the London Missionary Society in 1884, but afterwards became the property of the African Lakes Corporation; a larger steamer, the " Hedwig von Wissmann," carrying a quick-firing Krupp gun, was launched in 1900 by a German expedition under Lieutenant Schloifer; and others are owned by the " Tanganyika Concessions " and Katanga companies.
The company being unable to quell the revolt, Captain Hermann Wissmann - subsequently Major Hermann von Wissmann (1853-1905) - was sent out by Prince Bismarck as imperial commissioner.
Wissmann, with 1000 soldiers, chiefly Sudanese officered by Germans, and a German naval contingent, succeeded by the end of 1889 in crushing the power of the Arabs.
Wissmann remained in the country until 1891 as commissioner, and later (1895-1896) was for eighteen months governor of the colony - as the German sphere had been constituted by proclamation (1st of January 1897).
Towards the native population Wissmann's attitude was conciliatory, and under his rule the development of the resources of the country was pushed on.
The company was not strong enough to defend itself; troops had to be sent out by the emperor under Captain Wissmann, who as imperial commissioner took over the government.
The riverine tribes build excellent canoes and large" fighting "boats, and are almost uniformly expert boatmen and fishermen and live much on the water; so much so that Hermann von Wissmann and other travellers were struck by the insignificant leg development of several of these tribes.