What Leonardo da Vinci war machine had a conical armored body and many guns?

Leonardo da Vinci’s fighting vehicle was an armored tank design with a conical, turtle-like body and multiple guns. Leonardo sketched it in the Codex Arundel, probably in the late 15th century, while working on military engineering projects.

The vehicle was intended to move on wheels turned by people operating internal cranks. Its sloped armor could help deflect incoming projectiles, while guns arranged around the perimeter would allow firing in several directions. The concept resembles a tank, but it was not a tracked vehicle and was never built for battle.

A famous claim says Leonardo deliberately made the crank system unusable to prevent the design from being copied. Historians debate whether the apparent mechanical problem was intentional or simply an error in the drawing. The vehicle remains an important example of Leonardo combining protection, mobility, and concentrated firepower.