Two assault ladders in an illustration inside the 1535 edition of “De Re Militari” by Roberto Valturius.
Roberto Valturio (or latinized Valturius) was an italian humanist, tratizer and writer. For a long time he served the Dukes of Rimini Sigismondo Malatesta and his son Roberto. Valturius is chiefly known for his treatise on warfare”De re military”, in which there are a lot of descriptions and drawings of war machines.
Who-is-Who in MMS, History of machines, history of mechanical engineering, machine design, treatizer.