Treaties of Tilsit
Werther was the son of Generalleutnant (Lieutenant General) Von Werther. He himself also joined the Prussian military in 1787. He participated in the War of the Fourth Coalition as a Rittmeister in the Dragoon regiment of his father, who had died in 1802. After the Treaties of Tilsit, Werther left the army as a Captain due to a reduction in size of the armed forces. For a while, he then became a chamberlain to Friedrich Wilhelm III.