 Complete the following phrase:  Volunteering for the Red Army at the outset of the Russian Civil War, Trubnikov was first appointed as a military officer for his hometown. In May 1919 he was sent to the front, commanding a platoon, a company, and then a battalion in the 28th Rifle Regiment of the 7th Rifle Division. He fought on the Eastern Front against the White Army troops of Alexander Kolchak in the Votkinsk and Izhevsk districts, but in the summer the regiment was urgently transferred to the Southern Front, where Anton Denikin was 