 Complete the following phrase:  In February 1759 he received his own corps; he and Georg Ludwig von Puttkamer moved from Silesia to Poland, where they were commissioned to destroy Russian magazines. In June 1759, as the Russians, however, shifted their forces to western Poland, and marched toward the Oder river, a move that threatened the Prussian heartland, Brandenburg, and potentially Berlin. Frederick sent an army corps commanded by Friedrich August von Finck to contain the Russians; he sent a second column commanded by Christoph II von Dohna to support Finck. Wobersnow was at the vanguard of the second column. At 