23–24 August 1918. Five Bolshevik armed trains were attacked, supported by the British forces' own two armoured trains, and there were 600 Japanese casualties. This limited but decisive action eliminated organised Bolshevik resistance on the Ussuri front. By the end of October, the British force had finished its journey West from Vladivostok all the way to the front lines at Omsk. The unit stayed in the city for the next six months over the cold Siberian winter. It may have played a role in the coup in the city in November 1918 which brought Admiral Kolchack to power as 'Supreme Leader' of Russia. The force went forward with the advancing Czechs and Russians and continued to provide artillery support along the railway from Omsk to Ufa in October and November. The British would later form an important part of the 'Kama River Flotilla', a boat unit that assisted the Whites by attacking the Bolshevik forces along the course of the river. They bombarded Red troop concentrations, protected bridges and provided direct fire support and attacked Bolshevik boats on the river. In one action, the flotilla sank the Bolshevik flagship on the river and destroyed one other boat. They were later driven back by the Bolshevik advance on Perm. The small British force was withdrawn in the summer of 1919. All remaining Allied forces were evacuated in 1920, apart from the Japanese who stayed until 1922. Caucasus In 1917, Dunsterforce, an Allied military mission of under 1,000 Australian, British, and Canadian troops (drawn from the Mesopotamian and Western Fronts), accompanied by armoured cars, deployed from Hamadan some across Qajar Persia. It was named after its commander General Lionel Dunsterville. Its mission was to gather information, train and command local forces, and prevent the spread of German propaganda. Later on, Dunsterville was told to take and protect the city of Baku and its oil fields. During the early stages of the Russian Civil War the Caucasus region was governed by three de facto independent states, the Menshevik-dominated Democratic Republic of Georgia, the Republic of Armenia and the Azerbaijan Democratic Republic, and the main White Russian forces had no real control. The British feared that Baku could be captured by the Ottoman Empire, since their forces in the area were advancing, and if they gained control of the fleet in the port they could transport troops to the city of Krasnovodsk directly across