What armored Leonardo da Vinci vehicle was designed to move in any direction?

Leonardo da Vinci’s armored tank was a conical, covered fighting vehicle designed to move in any direction.

Leonardo drew the vehicle in the 1480s while working on military designs. Its sloping, conical shell was intended to deflect enemy projectiles, and a ring of small cannons projected through openings around the platform. Inside, several men would turn cranks connected to the wheels, theoretically driving the vehicle across a battlefield.

The machine is often called Leonardo’s tank, although that modern label is retrospective. It was not a modern tracked vehicle and was never documented as having been built or used in battle. The design also contains a likely mechanical problem: the internal gears, as commonly reconstructed, would make the wheels turn in conflicting directions. Some historians think this may have been deliberate, since Leonardo sometimes concealed military designs.

The vehicle belongs to a broader group of Renaissance siege and artillery concepts rather than to a successful operational army machine.