After holding the line near Warsaw, the corps was pushed back to the area near Modlin, where it saw heavy fighting until December.

When SS-Obergruppenführer Karl Pfeffer Wildenbruch's IX SS Mountain Corps and large numbers of Hungarian troops were encircled in Budapest in December 1944,[1] the corps was shifted south from Army Group A to join the 6th Army and to take part in the relief efforts.

[3] After the failure of Operation Konrad III, the corps was moved west to the area around Lake Balaton, where it was responsible for defending the left flank of the Operation Spring Awakening (Frühlingserwachen), near Stuhlweissenberg.

After the failure of this operation, the Soviet Vienna offensive tore a gap between the corps and the neighbouring Hungarian Third Army.

[4] After escaping an encirclement thanks to the efforts of the 9th SS Panzer Division "Hohenstaufen", the corps withdrew towards Vienna.