 Complete the following phrase:  Following his tour as an instructor, Willius returned to 3. Staffel on 31 March 1943. In January 1943, the Luftwaffe planned to move JG 26 to the Eastern Front. The idea was to exchange JG 26 with Jagdgeschwader 54 JG 5454th Fighter Wing which supported Army Group North. At the time of Willius return to his unit, the Gruppe was based at Dno and fighting in the vicinity of Demyansk, during and following the 