Leonardo da Vinci’s armored tank was a covered, circular vehicle armed with cannons.
Leonardo designed the fighting vehicle around 1487 for Ludovico Sforza, ruler of Milan. Its conical cover was inspired by a tortoise shell and was intended to protect soldiers inside from enemy fire. The platform carried light cannons around its perimeter, allowing defenders to fire in multiple directions.
The vehicle was meant to be moved by people turning cranks connected to wheels. A famous drawing appears to show a design flaw: the internal gears would make the wheels turn in opposite directions. Some historians think this may have been deliberate, either to prevent unauthorized construction or to conceal the intended mechanism.
Although commonly called a tank, Leonardo’s machine was never built or used in battle. It had no engine and was far smaller in concept than a modern armored fighting vehicle. Its importance lies in combining mobile protection, all-around firepower, and mechanical propulsion.