Three years after the toppling of the Provisional Government by the Bolsheviks in October 1917, the Red Army invaded the southern Caucasus republics of Azerbaijan, Georgia and Armenia. In May 1920, Bagramyan, upset with the country's social and political conditions, participated in a failed rebellion against the Dashnak-led government of Armenia. Later that year, he joined the Red Army. He was jailed and sent to work in the fields for several months but was allowed to rejoin the military with the outbreak of the Turkish–Armenian War. But in December 1920, Armenia was sovietized and the national army was subsequently disbanded. Bagramyan, however, chose to join the 11th Soviet Army and was appointed a cavalry regiment commander.