Reichshofrat
He became proprietor of the "Kollowrat" Infantry Regiment # 36 in 1801. In the same year, he became a member of the Aulic Council. He led the 25,400 Austrians of the 4th column at the Battle of Austerlitz in 1805. Advancing across the Pratzen plateau, his force found itself in the path of Napoleon's main attack. After severe fighting, Marshal Nicolas Soult's corps broke Kollowrat's Austrians and drove them off the field.