the Warsaw area itself was almost non-existent, about 12% of the 296 planes taking part in the operations were lost because they had to fly 1,600 km out over heavily defended enemy territory and then back over the same route. Most of the drops were made during night, at no more than 100–300 feet altitude, and poor accuracy left many parachuted packages stranded behind German-controlled territory. From September 13 on the Soviets began their own airdrop raids with supplies, and dropped about 55 tons in total. The drops continued until September 28. Finally on September 18 the Soviets allowed one USAAF flight of 110 B-17s of the 3 division Eighth Air Force to re-fuel and reload at Soviet airfields used in Operation Frantic, but it was too little too late. On their return flight to Foggia and then back to England the B-17's bombed the rail yards in Budapest, Hungary, which was still in German-occupied territory. Soviet participation: Berling landings on Powiśle The role of the Red Army during the Warsaw Uprising remains controversial and is still disputed by some historians. The Uprising started when the Red Army appeared on the city's doorstep, and the Poles in Warsaw were counting on Soviet aid coming in a matter of days. This basic scenario of an uprising against the Germans launched a few days before the arrival of Allied forces played out successfully in a number of European capitals, notably Paris and Prague. However, despite standing for about 40 days less than 10 km from Warsaw's city center, and then moving even closer, to the right bank of the Vistula river a few hundred meters away from the main battle of the uprising during its last two weeks, the Red Army did not extend effective aid to the desperate city. Some Western historians, as well as the official line of the Communist regime in Poland before 1989, claimed that the Red Army, exhausted by its long advance on its way to Warsaw, lacked sufficient fighting power to overcome the German forces around Warsaw and extend effective aid to the Uprising. However, the consensus among most historians is that Stalin did not want to aid the Home Army in Warsaw, made up of likely opponents of the Communist regime that he wanted to impose on Poland after the war, and other Allied powers were reluctant to intervene against Stalin's will. The Red Army