 Complete the following phrase:  At that time, the division was located at the Narew river. From November 1944 to January 1945, the division had to retreat from the Narew, and fought in the area of Osowiec, where it suffered heavy losses. The division reteated via Rastenburg, Korschen and Bartenstein towards Frisches Haff. The remts of the division were surrounded in the 