Leonardo da Vinci designed an armored tank-like fighting vehicle for military use.
His late-15th-century design resembled a large conical tortoise shell. Sloped armor plates were intended to protect the crew, while cannons projected around the vehicle’s perimeter. The machine was shown with internal mechanisms that would turn wheels and move the vehicle across the ground.
The design is often called Leonardo’s fighting vehicle rather than a fully realized tank. It was never built for Renaissance warfare, and historians have debated whether the apparent gear arrangement would actually move the machine. Some modern reconstructions corrected or reinterpreted the mechanism to make it operable.
Leonardo may have presented military inventions strategically to attract powerful patrons. The vehicle’s protective shell and all-around gun positions anticipate features associated with later armored fighting vehicles, but it lacked an engine and modern tank technology.