Leonardo da Vinci’s conical, armored military vehicle was the armored tank.
Leonardo sketched the fighting vehicle around 1487–1489. It resembled a covered, turtle-like platform with sloping armor and several small cannons projecting through openings. The sloped shell was intended to deflect incoming projectiles, while the vehicle’s broad shape offered protection to the people inside.
The proposed vehicle was to move through a system of cranks and gears operated by its crew. A famous drawing contains a gear arrangement that appears to prevent the vehicle from moving as intended, leading to claims that Leonardo deliberately inserted a flaw. Historians cannot establish with certainty whether the problem was intentional, accidental, or simply a feature of an unfinished sketch.
Calling it a modern tank is convenient but retrospective. Leonardo’s machine had armor and artillery, yet it was never built as a combat vehicle. Its significance lies in combining mobility, protection, and firepower in one Renaissance design.