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HMS Mimi and HMS Toutou were motor launches of the Royal Navy. After undergoing an unusual journey from Britain to Lake Tanganyika in the interior of Africa, the ships played an important role in the African naval struggle between Britain and Germany during World War I. The names mean Meow and Fido in Parisian slang. They had originally been named Dog and Cat by their erstwhile commander, Geoffrey Spicer-Simson, only to have the names rejected by an apparently scandalized Admiralty.

It took nearly a month and a half to travel the 100 or more miles from Fungurume to Sankisia, the railhead for a narrow-gauge railway. The terrain in between was mountainous and broken, requiring the construction of 150 bridges over various streams and gorges. The movement was accomplished by the brute force of two steam tractors, dozens of oxen, and hundreds of Africans employed for the expedition. At some points, even this was not enough, and complex winching systems were developed to lever the ships over the more formidable inclines. Even after the railroad was reached, the difficulties continued, as there were still some 500 miles to go. Streams which Spicer-Simson had depended on for navigation turned out to be nearly dry: the ships had to be raised on barrel rafts to float, and even then they had to be portaged dozens of times. Finally, however, the wearied expedition arrived at Lake Tanganyika on 26 October.

Mimi and Toutou were finally launched around the end of December, and by 26 December they experienced their first action. The German ship Kingani was sighted, and the allied "fleet" gave chase. In the lead of the formation was Mimi, commanded by Spicer-Simson. After evading the initial German fire, Mimi and Toutou opened fire at noon, eventually puncturing Kingani's hull below the waterline. With water coming in and the commander dead, the German ship struck her colours.