Quote from the wikipedia and other sources about Sergei Konstantinovich Belosselsky-Belozersky: "...the older son Sergei Konstantinovich (+1951), after an illustrious military career, including as a commanding officer of the Novorossiisk Dragoons, regiment of the Lancers of her Imperial Majesty, etc. fled with his family also to Vyborg at first (late 1917) and participated after this in the "White Movement" among other, as an advisor to General Yudenich, the commander of the Northwestern White Army (supported and financed by the British) and head of the Russian counter-revolutionary Northwestern "government", created with the help of Britain based at that time in Finland. In this capacity, he spent considerable time in 1918 in Finland as an envoy and liaison to General, later Marshal, Carl Gustav Mannerheim, a fellow-General and friend from the Russian Imperial Army who was the head of the White Army of Finland (in late 1880s Belosselsky-Belozersky and Mannerheim, as Russian imperial military officers, had been commissioned by the Chief of Staff to attend the top French military cavalry school together, and Mannerheim often was a guest of the Belosselsky-Belozersky family both on Krestovsky Ostrov, taking part in polo matches on the Belosselsky-Belozersky polo grounds on the estate as well as their homes in the city). Sergei Konstantinovich's attempts to persuade Mannerheim and the White Army of Finland to join the Yudenich army's attempt to take back Petrograd/St. Petersburg , failed (because of the key issue for Finns, centering around the recognition of Finland's independence; the Whites did not want change in "status quo" while the "Red" government recognized Finnish independence)..."
If this information is true, then my question to the serious Belosselsky-Belozersky family researches. Does anyone have any more detailed/documented information about the role of Sergei Konstantinovich during the Finnish Civil War (I've heard that he was even enlisted on the Lieutenant General's position in Mannerheim's headquarters), his later attempts to coordinate actions between Yudenich and Mannerheim in London to help the Russian White movement, and so on...? Unfortunately, there is very little information on this subject.