 The operation was accompanied by several other offensives, particularly the Lvov-Sandomierz Offensive of the 1st Ukrainian Front in the south; both offensives launched weeks after the start of the successful Operation Bagration to the north which cleared German forces from most of Belarus.After reaching its target objectives, the offensive momentum carried on as the Soviet forces advanced on Warsaw during August (2 August – 30 September 1944); however Soviet forces did not aid the Polish Warsaw Uprising, which is a matter of some controversy.On 15 June, Army Group North Ukraine under command of Josef Harpe was composed of the 4th Panzer Army, 1st Panzer Army, and the First Army (Hungary).