PCT4286785 Armee besieging a fortified city of Roman Antiquity using the turtle\'s device to reach the walls. Assault of fortifications: the sieges try to stop the progression of the attackers by throwing beams, stones and even mill wheels on their shields - 19th century engraving -; (add.info.: Armee besieging a fortified city of Roman Antiquity using the turtle\'s device to reach the walls. Assault of fortifications: the sieges try to stop the progression of the attackers by throwing beams, stones and even mill wheels on their shields - 19th century engraving -); by Patrice Cartier.