 The Romanian Army collapsed, the German 6th Army was encircled and destroyed while the German 8th Army retreated into the Carpathians.Accelerating the collapse was the coup in Bucharest on 23 August 1944 as King Michael dismissed Marshal Ion Antonescu as Prime Minister and declared war on Germany.Within a matter of days, most of Romania was occupied by the Soviet Union including most importantly, the Ploesti oil fields, which were Germany's most important source of oil.