He was on the 9th of July 1790 decisively defeated by the Swedes at the second Battle of Svenskund. Despite this defeat, Nassau-Siegen was promoted to admiral by the Tsarina. Nassau-Siegen's military incompetence forced him to seek retirement. He left Russia in 1792 for the Rhine, to fight the French Revolution. But after the Peace of Amiens in 1802, he returned to France, where he solicited without success a position in Napoleon's army. He returned to his estate at Tynna in Podolia in 1808, which was seized by Russia after the Partitions of Poland.