History by Polybius. Volume II. French edition translated from Greek by Dom Vincent Thuillier. Comments of Military Science enriched with critical and historical notes by M. De Folard. Paris, chez Pierre Gandouin, Julien-Michel Gandouin, Pierre-Francois Giffart and Nicolas-Pierre Armand, 1727. Printing by Jean-Baptiste Lamesle. Siege Towers with wheels used by the Holy Roman Emperor Frederick II (1194-1250) during the siege of Jerusalem. The Sixth Crusade. Engraving. Later colouration.