During the Third Battle of Courland, SE of Frauenburg, the Soviets managed to achieve a deep break-in on 21.12.1944 in the flank of the Division adjacent to the 290. Infanterie-Division. In response Müller and his battalion were dispatched to the Laugali-Pumpuri area. The enemy had captured Hills 145.1 and 135.2, which were of great significance for the fighting in the area, and so Müller personally led his men in an energetic attack that threw the Soviets off the hills. Although it would later change hands twice in bitter fighting, in the end Müller and his battalion remained in control of the hill, thereby permitting the subsequent successful defense. He would be awarded the Oakleaves to the Knight’s Cross for this action.