An anecdote from Luca Pacioli's De viribus quantitatis relates an incident with Leonardo da Vinci in his capacity as military engineer on campaign with Cesare Borgia.

One day Cesare Valentino, Duke of Romagna and present Lord of Piombino, found himself and his army at a river which was 24 paces wide, and could find no bridge, nor any material to make one except for a stack of wood all cut to a length of 16 paces. And from this wood, using neither iron nor rope nor any other construction, his noble engineer made a bridge sufficiently strong for the army to pass over.

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Source: Primary

Charles Nicholl; Nicholl, Charles. "Leonardo da Vinci. Flights of the Mind." E-book, p. 602.




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