The Battle of the Dukla Pass, also known as the Dukla, Carpatho–Dukla, Rzeszów–Dukla, or Dukla–Prešov offensive, was the battle for control over the Dukla Pass on the border between Poland and Slovakia on the Eastern Front of World War II between Nazi Germany and the Soviet Union in September–October 1944. It was part of the Soviet East Carpathian strategic offensive that also included the Carpathian–Uzhgorod offensive. The operation's primary goal, to provide support for the Slovak rebellion, was not achieved, but it concluded the full liberation of the Ukrainian SSR. The German resistance in the eastern Carpathian region was much stronger than expected. The battle which began on 8 September would not see the Soviet forces on the other side of the pass until 6 October, and German forces would stop their heavy resistance in the region only around 10 October. Five days to Prešov turned into fifty days to Svidník alone with over 70,000 casualties on both sides. Prešov that was to be reached in six days remained beyond the Czechoslovaks' grasp for four months. The battle would be counted among the most bloody in the entire Eastern Front and the history of Slovakia; one of the valleys in the pass, near the villages of Kapišová, Chyrowa, Iwla and Głojsce, would become known as the "Valley of Death". Background In summer 1944, Slovaks rebelled against the Nazis and the Czechoslovak government appealed to Soviets for help. On 31 August, Soviet marshal Ivan Konev was ordered to prepare plans for an offensive to destroy Nazi forces in Slovakia. The plan was to push through the old Slovak-Polish border in the Carpathian Mountains via the Dukla Pass near Svidník to penetrate Slovakia proper. In the meantime, however, the Germans had fortified the region, forming the Karpatenfestung ("Carpathian fortress") or Árpád Line. Battle The Soviet operation plan called for the Soviet forces to cross the pass and capture the town of Prešov within five days. The operation started on 8 September. It took the Soviets three days to take Krosno (it was captured on 11 September). One of the biggest battles in the pass took place on and around Hill 534 in the northwest from the town of Dukla; the battle to capture this hill lasted from 10 to 20 September, and during that period the control of the hill changed more than 20 times. The town of Dukla was seized on