A horn-player called cornicen blew his horn to give signals to tell the soldiers what to do. For example, he might give the signal for soldiers to gather around their standard
Jean-Joseph Rodolphe 1759
French horn in the park. This is pretty much how twisty they are lol.
Ballad horn about 1880–86 William Hillyard, English, 1821–1895 London, England
Omnitonic horn (Dupont, early 19th century)
Frédéric Nicolas Duvernoy (1765 –1838)
Balu horn made by Ion Balu