The Army Group participated in anti-partisan operations in Greece and Yugoslavia. During the course of these operations, several atrocities were committed, including the massacres of Kalavryta and Distomo in Greece. Furthermore, during the disarmament of the Italian army in September 1943, German troops executed over 5,000 Italian prisoners of war in the Cephallonia Massacre. At the same time, the Army Group successfully repelled the British attempt to seize the Italian-occupied Dodecanese Islands.