 Following the war, Augustin studied horsemanship, eventually becoming master at the Gendarmerie's Riding School in Lunéville.Mottin was promoted to Fourrier-Major in 1766, and retired with a pension in 1773.Using the assumed name "Mottin de La Balme," he wrote a book on horsemanship in 1773, titled "Essai sur l'équitation ou principes raisonnés sur l'Art de monter et de dresser les chevaux".