 This forced the Army Group E and the 2nd Panzer Army to set off through the very mountainous terrain of southwestern Serbia, northern Montenegro and finally southeast Bosnia towards Croatia.Throughout the journey they were left exposed to the Yugoslav Partisans' firepower, sometimes with the Allies' assistance of Floydforce.Army Group E was joined with what was left of Maximilian von Weichs' Army Group F. That army group had been dissolved on 25 March 1945.