Leonardo da Vinci’s armored vehicle is commonly regarded as an early design for a tank.
Leonardo sketched the fighting vehicle around 1487–1489 while working for Ludovico Sforza in Milan. Its broad, conical cover was intended to protect soldiers from enemy fire, while guns projected through openings around the perimeter. Inside, men would turn cranks connected to wheels, allowing the vehicle to move across the battlefield.
The machine was a concept rather than a completed Renaissance tank. Its sloping armor resembles the later form of tanks, but the proposed vehicle had serious practical problems. One famous drawing appears to show gears that would make the wheels work against each other, possibly because Leonardo deliberately concealed the design or made an error. Historians also debate whether the vehicle could have carried its heavy armor effectively.
It should not be confused with a modern tank, which uses an engine, tracks, and a rotating turret. Leonardo’s vehicle had wheels, crew-powered motion, and fixed gun positions.