In the summer of 1757 the Russians, led by Count William Fermor and Field Marshal Count Stepan Fyodorovich Apraksin in East Prussia. The old Field Marshal Johann von Lehwaldt commanded the Prussian troops. At the expressed orders of the king, he attacked the Russians who were several times superior in men and artillery at Battle of Gross-Jägersdorf, west of Insterburg. The battle ended with heavy Prussian losses.