The Soviets launched several follow-up offensives, later called the Voronezh-Kharkov Strategic Offensive. The Ostrogozhsk–Rossosh Offensive began on 12 January and destroyed large parts of the Second Hungarian Army and the remnants of Eighth Italian Army at the Don south-east of Voronezh. With the southern flank in danger, Second German Army was forced to withdraw from Voronezh and the Don. The operations continued until January and led Stavka to believe that they could deal a fatal blow to the Germans and decide the war in southern Russia. Operation Star, conducted by the Voronezh Front, was aimed at Kharkov, Kursk and Belgorod. Operation Gallop was conducted by the South-western Front against Voroshilovgrad, Donetsk and then towards the Sea of Azov, to cut off the German forces east of Donetsk. The operations began simultaneously at the end of January. The Soviets broke through quickly and in the north, Kursk fell on 18 February and Kharkov on 16 February after a German withdrawal, while in the south the Germans were pushed back to a line west of Voroshilovgrad. Army Groups Don, B and parts of Army Group A were renamed Army Group South, commanded by Manstein, on 12 February.