In 1757, Fermor led a Russian force that captured
Memel in
East Prussia, and was present at the
Battle of Gross-Jägersdorf. In 1758, he was appointed to command the Russian forces which had invaded
Prussia during the
Seven Years' War. He replaced
Stepan Fedorovich Apraksin who had displeased
Empress Elizabeth. Fermor reversed the previous commander’s policies towards the civilian population of occupied
East Prussia, denouncing the previous hard-line stance, and even having proclamations read apologising for it. On 25 August 1758, he led his army against
Frederick the Great at the
Battle of Zorndorf. The battle cost both sides heavy casualties. Afterwards, Fermor withdrew his forces eastwards. He was later relieved of his command and served as a subordinate to
Pyotr Saltykov during 1759. In 1760, he was in overall command of Russian forces during the
Raid on Berlin, which saw them and their Austrian allies briefly occupy the Prussian capital before withdrawing. ==Later life==