What Leonardo da Vinci machine was an armored vehicle powered by eight men?

Leonardo da Vinci’s tank was an armored fighting vehicle designed to be powered by eight men.

Leonardo sketched the fighting vehicle in the late 15th century. Its conical, turtle-like cover was reinforced with wooden plates and included openings for guns around the perimeter. Inside, cranks and gears were intended to turn the wheels, allowing a small crew to move the vehicle across a battlefield.

The machine was a proposal, not a completed Renaissance tank. One famous drawing appears to contain a gear arrangement that would make the vehicle move backward if built exactly as shown. Some historians think this may have been a deliberate concealment intended to prevent the design from being copied, while others regard it as an error or unresolved engineering problem.

Leonardo’s vehicle is related to later armored fighting machines but was not a modern tank. It lacked an engine, turret, and tested battlefield record. Its significance is that it brought armor, mobility, and gun fire together in one early concept.