Having believed the calls of the former General
Mikhail Dmitriyevich Bonch-Bruyevich, Garf voluntarily joined the Red Army and, on October 8, 1918, was appointed to the headquarters of the Eastern Front. While the front was commanded by
Sergey Kamenev, Garf was the head of the operational intelligence department of the front headquarters and field control. With the arrival of the new commander
Alexander Samoylo on July 7, 1919, and before the front was disbanded on January 15, 1920, Garf was the permanent chief of staff of the Eastern Front. After Samoylo, the front was sequentially commanded by
Sergei Kamenev (repeatedly),
Pavel Pavlovich Lebedev,
Mikhail Frunze, and
Vladimir Olderogge. Under the conditions of a constant change of commanders of the Eastern Front, Garf managed to ensure continuity and discipline of the troops. It's a rare case when one chief of staff “outlived” several of his immediate superiors, who didn't always even manage to get involved in the situation. After the successful Ufa operation (May 25 - June 20), Garf, as a recognized specialist in the "field of tactics of military operations using infantry", led the headquarters during the most active offensive operations of the Eastern Front. Under his leadership, the Zlatoust (June 24 - July 13) and Chelyabinsk (July 17 - August 4) operations were developed and successfully conducted. On August 14, 1919, the southern group of armies of the Eastern Front was transformed into the
Turkestan Front. The remaining front forces were tasked with defeating A.V. Kolchak and liberating Siberia. The headquarters developed and carried out the Petropavlovsk Operation with great skill from August to November 1919. During the offensive, Tobolsk (October 22), Petropavlovsk (October 31), and Omsk (November 14) were liberated. In December, Barnaul (December 11), Novonikolaevsk (December 14), and Tomsk (December 20) were taken. Finally, on January 7, 1920, Krasnoyarsk fell. The Peter and Paul offensive led to the complete defeat of the main forces of Kolchak's army. The Eastern Front had fully fulfilled its task, and by directive of the High Command of January 6, 1920, the Office of the Eastern Front was disbanded on January 15. For the final destruction of the scattered remnants of the Kolchak army, the 5th Army was left under the command of
Mikhail Matiyasevich. Before the latter took office on February 8, 1920, Garf commanded the army for some time, after which he was appointed chief of its headquarters. By the summer of 1920, the last centers of white resistance were suppressed, and on June 23, 1920, Garf was recalled to Moscow. The main battles of the Civil War were completed. For successfully preparing and conducting operations on the Eastern Front of the Civil War, Garf was awarded the
Order of the Red Banner in 1921. Being a non-partisan representative of a social class alien to the Bolsheviks, and also an ethnic German, for many years Garf held various leadership positions in the headquarters of the Red Army solely because of his professionalism. Over the years, he was assistant to the chief of the operational management of the field headquarters of the RVSR (July 15, 1920 - January 14, 1921); head of the organizational department of the headquarters of the Red Army (January 14, 1921 — September 24, 1921); the second assistant to the chief of staff of the Red Army (September 24, 1921 - January 5, 1924) (in charge of accounting, organization and mobilization issues; the command staff, organizational and mobilization departments were subordinate to him). In May 1924, when the accounting and organizational departments were separated into an independent Organization and Accounting Department, Garf was transferred to the post of its head. In October 1925, Garf became an assistant to the head of the Office of military schools of the Red Army, but after 2 months he was appointed deputy head of the Main Directorate of the Red Army. In January 1927 he became assistant to the head of the Directorate of Military Educational Institutions of the Red Army, but after 2 months he was appointed deputy head of the Main Directorate of the Red Army. In November 1929 he was transferred to the position of assistant chief of armaments of the Red Army. In February 1931, Garf switched to teaching, first as a military instructor at the Moscow Electrotechnical Institute of Communications (MEIS), and since August 1932, as deputy head of the Telecommunications Engineering Academy named after V.N. Podbelsky at the People's Commissariat of Communications of the USSR. At the same time, Garf headed the command faculty of the academy, he was assigned the highest service category K-14. In September 1934, he was appointed to his last post - the head of the Academy of Communications named after V.N. Podbelsky. With the introduction of military ranks in the Red Army in September 1935, and order of the USSR People's Commissar of Defense No. 2395 dated November 20, 1935, Garf was awarded the personal rank of division commander, which can be regarded as a certain reduction. The highest service category K-14 assumed the assignment of a rank not lower than the commander of the 2nd rank. By the arbitrariness of
Kliment Voroshilov, such a decrease affected almost all the heads of military academies. Garf led the academy in those years when the difficult process of merging the Moscow Electrotechnical Institute of Communications and the academy named after V.N. Podbelsky. It ended after his arrest. ==Victim of political repression in the USSR and rehabilitation==