 Complete the following phrase:  At the end of August 1944, the 2nd and 3rd Armies were mobilised again, in order to defend Transylvania and South Hungary following Romanias change of sides. The 2nd Army was subordinated to Army Group Fretter-Pico. In the wake of the Carpatho-Dukla Offensive and Battle of Debrecen, the Hungarian-German armies were pushed back during September and October into the Great Hungarian Plain. During these battles, on 15 October, Reichsverweser Horthy was removed by the SS after his unilateral agreement of a ceasefire with the Soviet Union during 