Lublin–Brest Offensive Begins
The Lublin–Brest Offensive (Russian: Люблин‐Брестская наступательная операция, 18 July – 2 August 1944) was a part of the Operation Bagration strategic offensive by Soviet forces to clear Germans from central‐eastern Poland.
The offensive was executed by the left (southern) wing of the 1st Belorussian Front and took place during July 1944; it was opposed by the German Army Group South Ukraine and Army Group Centre.
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 was continued 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 June 22, 1944, the Soviets launched their main summer offensive (Operation Bagration) in Belarus. Involving 2.5 million soldiers and over 6,000 tanks, the offensive sought to destroy Army Group Center while also preventing the Germans from diverting troops to combat the Allied landings in France. In the ensuing battle, the Wehrmacht suffered one its worst defeats of the war as Army Group Center was shattered and Minsk liberated.
BBC - History: World War Two