At the age of 14, Montagne joined the French navy, and took part in Napoleon's invasion of Egypt. In 1802, he returned to France to study medicine, and two years later became a military surgeon.
In 1845, he was one of the first scientists (with Marie-Anne Libert)[1] to provide a description of Phytophthora infestans, a potato blight fungus he referred to as Botrytis infestans. Montagne is also known for investigations of mycological species native to Guyane.
He contributed numerous articles to the Archives de Botanique and the Annales des Sciences naturelles.