Very surprisingly and to his extreme frustration, Rybalko spent the first year of the war as a lecturer in Kazan. He finally got an operational assignment in May 1942, as deputy commander of the
3rd Tank Army of the
Reserve of the Supreme High Command. Throughout the war, Rybalko's name was closely associated with the 3rd Tank Army. In the winter of 1942–1943, included in the
Voronezh Front, his army spearheaded the different operations that tried to exploit and transform the Germans' defeat in Stalingrad into a large-scale strategic victory in the southern theater of operations. That included
Operation Star in February, which was aimed at the liberation of
Kharkov, one of the first major Soviet cities to be reconquered by the Red Army. However,
Erich von Manstein's
counteroffensive recaptured the city and inflicted serious damages to the exhausted and overextended 3rd Tank Army. Refitted and renamed the 3rd
Guards Tank Army, Rybalko's army played crucial roles in the strategic counteroffensives that followed the
Battle of Kursk (
Operation Kutuzov), in the
recapture of Kiev (6 November 1943). The winter and the spring of 1944 saw a succession of large operations, aiming at the destruction of the southern wing of the
Wehrmacht. Operations (
Zhitomir-Berdichev in December 1943 to January 1944 and
Proskurov-Chernivtsi in March to April 1944) succeeded at least in the complete liberation of
Ukraine by the end of the summer. During the various operations, Rybalko showed impressive tactical and operational skills, particularly during the
Lvov-Sandomierz Operation. Still in command of his
3rd Guards Tank Army, Rybalko took a major place in the various operations that were launched in North Ukraine:
Galicia (summer 1944) and
Silesia (late 1944 and winter 1945). Finally, as part of
Ivan Konev's
1st Ukrainian Front, Rybalko's army was one of the four Guards Tank armies engaged in the giant
Battle for Berlin. Immediately after the capture of
Berlin, Rybalko and his tank army were tasked with the assault on the city in the
Prague offensive and on 9 May liberated
Prague. ==Postwar==