Beginning on April 6, the army formed the right flank of the Soviet forces in the assault on Königsberg. One corps was to hold the line while two corps with a total of six rifle divisions took part in the attack. 50th Army was reinforced with artillery, 65 tanks and 42 heavy self-propelled guns (ISU-122 and ISU-152), and one assault engineer-sapper brigade. On the first day the army's units had advanced up to two kilometres, capturing a fort west of Baydritten and clearing 39 city blocks. On the 7th an additional 1.5 – 2 km penetration was made, helping to force the German garrison back to their second position. On the 8th the army, closely cooperating along its right flank with the 43rd Army, captured the Palfe area. The German forces capitulated late in the day on the 9th, and on the 10th the remaining pockets of resistance were eliminated.