 After healing his leg wound in a field hospital, he was taken first to Darnitsa, then to Ryazan and finally on a train transport to Siberia.In captivity in Camp Berezovka near Lake Baikal in Siberia he participated in a Marxist discussion group until 1917.In 1918, he joined the Communist (Social Democratic) Party of the Foreign Workers of Siberia, a sub-group of the Russian Communist Party.