Johann Georg Sauer (born in Hanau, 6 January 1713 – died in Leiden, 18 December 1818), was a long serving soldier in the army of the Dutch Republic, who lived in two centuries. Johann enlisted in the army of the Dutch Republic on 7 March 1734. He fought in the War of the Austrian Succession, taking part in the German campaign (1743), the Battle of Fontenoy (1745), the Battle of Lafeld (1746), and the Siege of Bergen-op-Zoom (1747), the latter in which he was wounded several times. He remained with the army during the years the Republic remained neutral. His final engagement was the defense of Klundert in 1793. After a career of 65 years of service in the 8th National Infantry Regiment (then commanded by Lieutenant-general Bosc de la Calmette), Johann retired in 1795. After the restoration