early days of the German invasion of the Soviet Union, Grechko served in the Operational Directorate of the General Staff of the Red Army. Grechko's first command during World War II was of the 34th Cavalry Division, which put up a valiant fight around Kremenchug (near Kyiv) in Ukraine during the First Battle of Kiev. The division was assigned to the 26th, 38th and 6th Armies on the Southwestern Front. On 15 January 1942, Grechko was put in command of the 5th Cavalry Corps and took part in the Barvenkovo–Lozovaya offensive. From March 1942, he was appointed as commander of the operational group of troops in the Southern Front, which operated in the Donbas. Starting 15 April 1942, Grechko was placed in command of 12th Army and took part in the defense of Voroshilovgrad and from July, took part in the Battle of the Caucasus. In September 1942, Grechko commanded the 47th Army and at the same time acting as commander of the Novorossiysk Defensive Region. He commanded the 47th Army in the Transcaucasian Front from 19 October 1942 and took part in the Tuapse Operation. From 5 January 1943, Grechko was commander of the 56th Army in the Transcaucasian Front, during which he took part in the North Caucasian Strategic Offensive Operation. After fierce battles in January, his unit broke through the heavily fortified enemy defenses and reached the approaches to Krasnodar. From February to March, as part of the North Caucasian Front, he participated in the Krasnodar Offensive, and then in a number of local and mostly unsuccessful offensive operations of the front troops. In September 1943, the troops of the 56th Army, in cooperation with the 9th and the 18th Armies, liberated the Taman Peninsula from the direction of Novorossiysk, during the Novorossiysk-Taman Strategic Offensive Operation. Grechko served as the deputy commander of the Voronezh Front from 16 October 1943 and on 20 October, he was appointed as deputy commander of the 1st Ukrainian Front. During this time, he fought in the Battle of the Dnieper and Second Battle of Kiev. Then, on 14 December 1943, he was made the Commanding General of 1st Guards Army, a position he held until the end of the war. The First Guards Army was a part of the 4th Ukrainian Front, which was led by Col.-Gen. Ivan Yefimovich Petrov. Grechko led the 1st Guards in a number of offensive operations,