 Complete the following phrase:  In 19051907, Rei participated in the Russian revolution of 1905. In 1906, he edited the underground paper Sotsiaaldemokraat Social Democrat in Tallinn. Between 1912 and 1913, he was in compulsory army service. In 19131914 he worked as a lawyer in Viljandi. In 19141917 Rei was an artillery officer in World War I at the Fort of St. Petersburg. In 1917 and 1918 he was in the Estonian army units formed after the 