On March 4th Marshal of the Soviet Union Georgy Zhukov's 1st Ukrainian Front, including the 3rd Guards Tank Army and 4th Tank Army, attacked German Army Group South's left wing and forged numerous penetrations in German defensive lines already heavily weakened following the battle for the Korsun pocket.
Throughout the winter of 1943-1944 Stavka maintained a relentless pace, consistently ordering up sequential offensives that never allowed the Germans to effectively regroup and build up reserves. In the late winter and early spring of 1944 the 1st, 2nd, 3rd and 4th Ukrainian Fronts, in opposition to German forces situated in the Western Ukraine, launched a massive series of offensives that would run along the breadth of the German defensive line south of the Pripet Marshes all the way to the Black Sea.
