In October 1944, under the command of General Maximilian Fretter-Pico, the 6th Army encircled and destroyed three Soviet corps of Mobile Group Pliyev under the command of Issa Pliyev in the Battle of Debrecen. During this time, the 6th Army had the Hungarian Second Army placed under its command, and it was known as "Army Group Fretter-Pico" ("Armeegruppe "Fretter-Pico").