of Saxony, king of Poland and a close friend of Field Marshal Count Frederick Augustus Rutowsky.
His sister Marie Dyhern was the mother of the famous Marshal François Christophe de Kellermann, 1. duke of Valmy.
Dyhern's grandniece, Baroness Caroline de Kottwitz, was the wife of the famous Prussian field marshal Count August Neidhardt von Gneisenau, who was a prominent figure in the German Campaign of 1813 and played an important role in the Battle of Waterloo under Blücher in 1815.
During the War of the Austrian Succession, Dyhern fought as a major in Prague in 1741, as Marshal Maurice de Saxe made his unexpected night attack on the Bohemian capital.
In 1745 he was a captain and in 1752 a generalmajor and also a general lieutenant of a Saxon regiment in service of the King Louis XV of France, with whom Dyhern was acquainted already since the middle of the 1730s, as he was studying and living in Versailles and Paris.
Only a few weeks before the battle, Dyhern was still trying to make an agreement with the Prince de Isenburg, hessian commander, at their meeting in Champs-Élysées in Paris, but unsuccessfully.