Weichs was promoted to Field Marshal on 1 February 1943. In August 1943 Weichs was appointed Commander of Army Group F in the Balkans directing operations against local partisan groups. Since August 1943 Weichs was also OB Südost, commander-in-chief of the German occupied Greece and the Balkans (Yugoslavia, Albania and Thrace) whose headquarters were first in Belgrade and since 5 October 1944 in Vukovar. In April 1944 Weichs was appointed to the position of commander of all German troops stationed in Hungary. In late 1944, he oversaw the German retreat from Greece and most of Yugoslavia.