At the beginning of 1759 Finck became lieutenant-general, and in this rank commanded a corps at the disastrous Battle of Kunersdorf, where he did good service both on the field of battle and in the rallying of the beaten Prussians; Frederick eventually having handed over command to him. On September 21 Finck fought, in concert with General Johann Jakob von Wunsch, the Battle of Korbitz, in which the Austrians and the contingents of the minor states of the Empire were defeated. For this action Frederick gave Finck the Order of the Black Eagle.