Operation Bagration (Russian: Операция Багратион, romanized: Operatsiya Bagration) was the codename for the 1944 Soviet Byelorussian strategic offensive operation (Russian: Белорусская наступательная операция «Багратион», romanized: Belorusskaya nastupatelnaya operatsiya "Bagration"), a military campaign fought between 22 June and 19 August 1944 in Soviet Byelorussia in the Eastern Front of World War II, just over two weeks after the start of Operation Overlord in the west. It was during this operation that Nazi Germany was forced to fight simultaneously on two major fronts for the first time since the war began. The Soviet Union destroyed 28 of the divisions of Army Group Centre and completely shattered the German front line. The overall engagement is the largest defeat in German military history, with around 450,000 German casualties, while setting the stage for the subsequent isolation of 300,000 German soldiers in the Courland Pocket.
On 22 June 1944, the Red Army attacked Army Group Centre in Byelorussia, with the objective of encircling and destroying its main component armies. By 28 June, the German 4th Army had been destroyed, along with most of the Third Panzer and Ninth Armies. The Red Army exploited the collapse of the German front line to encircle German formations in the vicinity of Minsk in the Minsk Offensive and destroy them, with Minsk liberated on 4 July. With the end of effective German resistance in Byelorussia, the Soviet offensive continued on to Lithuania, Poland and Romania over the course of July and August.