sentences:  He studied in Imperial School of Jurisprudence and volunteered to Mikhailovskaya artillery school, completing its shortened wartime course in December 1916.He served at the front of World War I with the Don cossack artillery battery in 1917.Following the Russian Revolution of 1917 and his parents' deaths a few years apart from typhus, Tschebotarioff was left responsible for his younger sister Valentina.