The 1st Infantry Division returned to its native East Prussia in the summer 1944. Except for participating in the urgent and temporary link-up with the now-isolated Army Group North in Lithuania (Operation Doppelkopf), the unit remained to defend the easternmost German province from the advancing Red Army. Alternating between 3rd Panzer and 4th Armies, the division was trapped in the Königsberg/Samland area after it was cut off from the rest of Germany by end January 1945.