Army Group Center was the target. Outthinking Hitler and his general staff, the Russians attacked on June 22. Hitler refused to allow those units that were still in place to retreat, and the front began to collapse. By July 3 the Army was retreating without Hitlers permission, and two-thirds of the Ninth Army was destroyed. When the last avenue of escape was closed with the recapture of Minsk, 25 of 38 Army Group Center divisions were destroyed.
On June 28 Hitler combined the Command of Army Group Center and Army Group North Ukraine under FeldmarschallWalther Model. This was too late to save Army Group Center, and Model could only stabilize his front and wait for the Red Army to lose momentum.
On July 13, The First Belorussian Front and the First Ukrainian Front under Zhukov and Vasilevski began an attack that pushed the Germans into Poland. Within two weeks the Red Army was sitting outside the capital. Stalin ordered them to wait and let the London-based Polish Home Army expire under German guns, saving him a potential postwar rival for political power.
On August 20, the Red Army attacked Romania, a Nazi ally, and advanced on the ruins of German oil production in Ploesti on August 30. The Sixth and Eighth German armies were encircled near Kishinev. The Romanians accepted Allied surrender terms and declared war on Germany on August 23.
Bulgaria, another German ally, was invaded on September 8, and asked for armistice on the next day. She too declared war on Germany. This cut off Army Groups E and F in Greece, Albania and Yugoslavia. A forced march through the mountains of Yugoslavia under attack from Titos partisans was completed in mid-November. On September 28, the Red Army began its liberation of Yugoslavia and marched on the capital of Belgrade on October 20.
On November 8, Red Army units reached Budapest in Hungary, another German ally. The citys defenses held up the Third Ukrainian Front for six weeks, as the Sixth and Eighth Armies, backed by the retreating Army Groups E and F, fought hard. On December 27, Budapest fell under attack from two Soviet Army Fronts. A Soviet-sponsored government declared war on Germany on December 29.
East Prussia, ancient home of Germany's best military leaders including General Heinz Guderian, was cut off and Koningsberg turned into a fortress. Civilians were evacuated on ships that hadn't moved for lack of oil in four years. Soviet submarines in the Baltic preyed on German shipping, with the worst maritime disaster, the Wilhelm Gustloff, a civilian passenger ship carrying over 11,000 refugees, was torpedoed by the Soviet Navy submarine S-13 on January 30, 1945. 9.543 were recorded as dying, but as there was no ship's manifest, the actual death toll would never be known.
Finland had seen static fighting for years, but with the advances all over the Soviet Union, it was only a matter of time before the Finns were threatened with invasion. The German Twentieth Mountain Army, after failing to take Leningrad, was left in a void after the Finns were attacked and thrown out of the war in a three month offensive from June-September 1944. The Germans marched out of Finland, withdrawing 500 miles across arctic wilderness. The Finns, in accordance with their Russian armistice treaty, tried to disarm the Twentieth Mountain Army. After some clashes, they escaped unmolested. German troops in Norway held the Russians inside Finland, ending the offensive in the North. Finland entered the war against Germany on March 3, 1945.
The Red Army, reinvigorated and victorious, had pushed their enemies out of Soviet territory. They would now destroy them on their own ground. The Third Reich, which Hitler had boasted would last for a thousand years, had months to live.