Stock Photo - Perfrigendi catharactas tool or window - a tower high above ductile iron, Warfare in the Middle Ages, war equipment, above: iron grille on windows for defense, below: mobile height-adjustable tower for attack, woodcut, p. 330, (Liber decimus), 1483, Roberto Valturio: [De re militari]. Verona: [Boninus de Boninis], [1483]

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