What kind of bridge did Leonardo da Vinci design to be rapidly deployed by soldiers?

Leonardo da Vinci designed a revolving bridge intended for rapid military deployment.

His bridge concept was designed to swing or pivot, allowing troops to cross a waterway and then making the crossing easier to control or remove. Leonardo’s military engineering notebooks include bridges alongside weapons, fortifications, and machines for moving heavy materials.

The design addressed a practical battlefield problem: armies needed temporary crossings that could be assembled quickly and transported with comparatively little difficulty. A revolving mechanism also offered an alternative to a permanently fixed bridge or a conventional drawbridge.

Leonardo produced many bridge studies, so descriptions can vary between compact portable bridges and larger structural designs. The important identifying feature here is rotation, not simply the ability to open. A drawbridge lifts, while a revolving bridge moves around a pivot or turning support.