See John Elting, Swords Around A Throne, page 507, fourth paragraph from the top of the page.

On page 404 of the same volume, it reads, regarding Saxon troops after Leipzig, '...the two crack regiments of Saxon cuirassiers and a number of Saxon officers and men who had received the Legion of Honor voluntarily remained with Napoleon until he sent them home with a letter of appreciation.'

There are also excellent selections on the Confederation of the Rhine in the older volumes of La Sabretache: 1899 on the Regiment de Francfort; 1903 on Baden; 1906 on the Saxons; 1908 on the Saxon Duchies; 1909 on the Bavarians; and 1911 on Hesse-Darmstadt.