under the command of Luftwaffe Major-General Rainer Stahel. The Soviet 35th Guards Tank Brigade initially took the airport, defended by the battalion of paratroopers; intense street-by-street fighting then commenced as the Soviets attempted to reduce the defence. The breakout attempt On 12 July, the garrison's parent formation, 3rd Panzer Army, counter-attacked. 6th Panzer Division, organised into two groups ("Pössl" and "Stahl") attacked eastwards from outside the encirclement (the divisional commander and Colonel-General Reinhardt personally accompanied the advance group). The opposing Soviet forces, taken by surprise and hampered by extended supply lines, were unable to hold the cordon, and 6th Panzer's forces were able to advance some 50 km to link up with forward elements from the Vilnius garrison. A fierce battle on the banks of the Neris ensued as men of the Polish Home Army unsuccessfully attempted to stop the relief troops. In the city itself, a Soviet attack on the morning of 13 July split the German forces into two pockets centred on the prison and the observatory; around 3,000 Germans escaped through the corridor opened by the 6th Panzer Division before Soviet forces closed the gap. Even so, 12,000–13,000 German troops were lost in the city, which was finally captured towards the evening of 13 July. The battle was marked by an uprising under the code-name Operation Ostra Brama by the Polish Home Army, in expectation of the arrival of the Red Army, as part of Operation Tempest. Despite the Soviet forces' success, Rotmistrov's commitment of a tank corps in costly urban fighting (along with earlier disagreements with his Front commander, Ivan Chernyakhovsky) led to his replacement as commander of 5th Guards Tank Army. Outcome While the German aim of holding Vilnius as a Fester Platz or fortress was not achieved, the tenacious defence contributed to stopping the Red Army's drive west for a few precious days. Most importantly, it tied down the 5th Guards Tank Army, which had been instrumental in the initial successes of the Red Army during Operation Bagration. This delay gave German forces a chance to re-establish something resembling a continuous defence line further to the west. Hitler recognised this achievement by awarding Stahel the 79th set of Swords to the Knight's Cross of the Iron Cross awarded during the war. Nevertheless, the outcome fell far short of what the German command had hoped for, and the continuous frontline that was established only held