 Complete the following phrase:  In April 1759 Frederick led his main army from Saxony into Lower Silesia to keep the Russian army in western Poland separated from Dauns Austrians in Bohemia. Meanwhile, a smaller Prussian force under Fredericks younger brother, Prince Henry, remained in Saxony to harass Bohemia through the Ore Mountains, winning the Battle of Peterswalde and a series of other minor engagements, as well as destroying several Austrian ammunition dumps and bridges before retreating into Saxony. The Russians continued to press into Neumark; on 23 July the new Russian commander, Count Pyotr Saltykov, led 47,000 men in defeating 26,000 Prussians commanded by General Carl Heinrich von Wedel at the 