Infantry (RMLI), 548th (Dundee) Army Troops Company, Royal Engineers, 2/10th (Cyclist) Battalion, Royal ScotsRoyal Scots, 52nd Battalion, Manchester Regiment, and elements of the Royal Dublin Fusiliers. Slavo-British Allied Legion (SBAL): a British-trained and led contingent composed mostly of expatriate Russian anti-Bolshevik, Finnish and Estonian volunteers (including Dyer's Battalion). Canadian Field Artillery (67th and 68th Batteries of the 16th Brigade, Canadian Field Artillery) Royal Air Force: contingent comprising Airco DH.4 bombers, Fairey Campania and Sopwith Baby seaplanes along with a single Sopwith Camel fighter. United States North Russia Expeditionary Force (also known as the Polar Bear Expedition): approximately 8,000 personnel from the US Army, including the: 310th Engineers, 339th Infantry, 337th Field Hospital, and 337th Ambulance Company. Also the 167th and 168th Railroad Companies, which were sent to Murmansk to operate the Murmansk to Petrograd line. US Navy: the cruiser during August and September 1918 (including 53 personnel attached to British naval units) France: 2,000 French Army personnel, mainly from the Armée coloniale (e.g. the 21st Colonial Battalion) and engineers. Other countries: 1,000 Serbian and Polish infantry attached to White Russian forces in the north (as distinct to those in Siberia forces, which included the Czechoslovak Legion); 1,200 Italians, a small number of volunteers from other countries. Baltics and Northwestern Russia Although the Estonian Army had attained control over its country, the opposing 7th and Estonian Red Armies were still active. The Estonian High Command decided to invade across the border into Russia in support of the White Russian Northern Corps. They went on offensive at Narva, catching the Soviets by surprise and destroying their 6th Division. Estonian and White attacks were supported along the Gulf of Finland's coast by the Royal Navy and the Estonian Navy and marines. On the night of 4 December, the cruiser struck a German-laid mine while on patrol duties north of Liepāja, and sank with the loss of 11 of her crew. At this time, the new Estonian government was weak and desperate. The Estonian Prime Minister asked Britain to send military forces to defend his capital, and even requested that his state be declared a British protectorate. The British would not meet these pleas. British cruisers and destroyers soon sailed up the coast close to the Estonian–Russian border and laid down a devastating barrage on the advancing Bolsheviks' supply lines. On 26 December, British warships captured the Bolshevik destroyers and , which at the