Marshal of the Soviet Union Ivan Konev, commander of the 1st Ukrainian Front, in a 31 January directive, ordered the 6th Army to attack the rear of the German forces defending Breslau, and to capture the city within four days of the beginning of the attack, part of the Lower Silesian Offensive. The Breslau attack was not a priority for Konev, as the same directive also tasked his troops with reaching the Elbe and capturing Berlin. However, the capture of Breslau would secure a crucial road junction, ensuing uninterrupted supply of the front. The start of the attack of the 6th Army was delayed for two days, from 6 to 8 February, by the overstretched supply lines of the front, which resulted from the advances it made during the Vistula–Oder Offensive. Due to a lack of rail transport, fuel and ammunition had to be transported from right bank of the Vistula to the Oder bridgeheads by road. Despite securing vehicles from the units defending the bridgehead, the 6th Army scraped together just 170 vehicles to transport 350 tons of ammunition and 180 tons of fuel. By the morning of 8 February, artillery and mortar units had enough ammunition for between two and five units of fire and infantry guns enough for between one and a half and two units of fire. The only tank support for the army was provided by the 7th Guards Mechanized Corps of Lieutenant General Ivan Korchagin, which late on 7 February fielded 186 T-34 tanks, and 21 each of the ISU-122 and SU-76 self-propelled gun, and the SU-85 tank destroyer – almost at its authorized strength. Only six T-34s were listed as under repair. Nearly an hour of artillery bombardment, begun at 08:35 on 8 February, preceded the start of the 6th Army attack. Elements of the 7th Guards Mechanized Corps crossed to the bridgehead, accompanied by the artillery bombardment, and by 12:00 its first echelon, which consisted of the 24th Guards Mechanized and 57th Guards Tank Brigades, outran their infantry support and advanced into the rear of the German defenses. The two forward brigades ran into fierce German resistance on the railway line from Breslau to the southwest on 10 and 11 February, with the 25th Guards Mechanized Brigade and 57th Guards bogged down at the Domslau station and Koberwitz village and station, respectively. They suffered heavy losses in tanks and men to German tanks and artillery, as well as panzerfausts fired from house basements.