20 Ancient Superweapons We Don’t Know Exist

Greek fire had such a reputation that one might have thought it was a weapon invented after the fact, but the Byzantine Empire used it to devastating effect, especially at sea. It could continue to burn on the water, which meant that an enemy ship was not only under attack but suddenly found itself trapped in the midst of a floating nightmare where usual reflexes—such as jumping overboard—offered no solution.

The Assyrians did not merely pound on the walls in the hope that everything would turn out for the best; they rolled entire towers toward enemy cities, like massive, moving architectural structures. These machines allowed archers to fire from above while troops pressed against the fortifications; as for the defenders who saw them approaching, they must have seemed less like weapons of war than a foreshadowing of the future.

A tank is one thing, but a tank equipped with blades protruding from its wheels is in a whole different psychological category. Even if blade tanks weren’t always decisive from a tactical standpoint, they were designed to tear through infantry formations, and the mere sight of one charging at full speed was enough to undermine discipline even before contact was made.

The Hélepolis, one of the largest siege towers ever built, was essentially a mobile fortress packed with artillery. It was gigantic, extremely well-protected, and designed to dominate the ramparts thanks to its dizzying height and firepower—which, in ancient times, was equivalent to entering hand-to-hand combat with a structure capable of firing back.

The Roman corvus transformed naval combat into exactly what Rome wanted: a land battle set against a backdrop of waves. By launching a spike-studded boarding ramp onto enemy ships, the Romans neutralized their opponents’ naval superiority and allowed their infantry to fight in the close-quarters, brutal style to which they were accustomed—a strategic ploy disguised as a simple plank.

War elephants were not just large, armored animals—though that alone would have been enough. They served as shock troops, noise weapons, and instruments of terror, capable of breaking enemy formations simply by forcing soldiers to hold their ground while several metric tons of muscle, tusks, and chaos bore down on them.

The repeating crossbow lacked the power of heavier siege weapons, but it made up for this with its speed and rate of fire. At a time when many projectile weapons still required careful loading and great physical strength, the ability to fire bolts one after another at a steady pace changed the tempo of battle in a way that opponents must have felt immediately.

The gastraphetes, or “ventral bow,” resembled a cross between a giant crossbow and a machine from a forgotten workshop. It allowed its users to generate more force than a hand-held bow, making it one of those crucial intermediate inventions that quietly advanced the art of war toward true mechanical artillery.

Whether or not later accounts of this event are entirely accurate, the device attributed to Archimedes was intended to seize attacking ships and wreak havoc near the ramparts of Syracuse. The mere possibility that a concealed machine could suddenly lift, capsize, or destroy a ship would have been enough to make any assault on the harbor a doomed endeavor—exactly as great defensive weapons are meant to do.

Clay pots filled with flammable mixtures don’t seem very impressive—until you imagine them being smashed against wooden fortifications, tight ranks of soldiers, or the rooftops of a besieged city. Incendiary weapons in ancient times were terrifying because fire spread faster than orders could be relayed, and once panic and flames began to feed off each other, an entire line of defense could collapse.

By the standards of the time, ballistae were precision machines, capable of launching heavy projectiles with enough force to pierce men or breach defensive structures. They allowed armies to kill from a distance with a precision that felt personal, which was part of what made them so formidable: one was not simply under bombardment; one was being targeted by a machine.

The polybolos was a continuous-fire artillery weapon, which seems strangely modern—and, in principle, it certainly was. It used a chain mechanism to automate part of the firing cycle, and even though machines in antiquity could be temperamental, the idea that a single mechanism could continuously feed and launch projectiles might have seemed almost unfair.

A battering ram, on its own, is dangerous; a battering ram protected inside a covered shelter is an entire system. These mobile shelters allow attackers to pound on the gates and walls while protecting their men from arrows, stones, and gunfire, turning what might have been a desperate charge into a long and grueling process for everyone inside the city.

Caltrops were brutally simple, which is often the hallmark of a formidable weapon. Scattered along roads, in fields, or on likely supply routes, these small, spiked devices could maim horses, break their momentum, and force the enemy to slow down at the worst possible moment—making them disproportionately effective for an object that fit in the palm of one’s hand.

Flaming arrows were not simply ordinary arrows with a touch of spectacle added to them. When used effectively against ships, siege works, rooftops, or supply depots, they could cause panic far beyond their size, for as soon as flames appeared in several places at once, the defense turned into a struggle against chaos.

A projectile is dangerous enough when it causes a clean wound, but armies and hunters in ancient times would sometimes make the injury considerably worse by adding toxins. Poisoned arrows turned even a minor wound into a lingering threat, and there is a particular terror in knowing that a simple scratch can continue to harm you long after the arrow itself is gone.

The seat hook was designed to latch onto sections of a wall or defensive structures, pulling and tearing at them until they gave way. It may seem rudimentary, but there is something unsettling about a weapon designed to patiently destroy whatever one is hiding behind—especially since the very purpose of a wall is to give the impression of solidity.

In certain regions of the ancient and medieval world, armies used containers filled with naphtha and similar substances as explosive or incendiary weapons. These attacks combined fire, noise, and unpredictability in a way that could make defenders feel as though the battlefield itself had become unstable.

Torsion catapults used bundles of tightly twisted fibers or tendons to store colossal amounts of energy—a strangely elegant idea for such a violent machine. They could hurl stones with such force that they could destroy fortifications or pierce through bodies, and there’s nothing gentle about facing a weapon that hurls a chunk of a hill at you.

Sometimes, the most formidable weapon of antiquity was not what breached the wall, but what disappeared beneath it. Sappers dug tunnels beneath the fortifications to undermine the foundations and cause sections of the wall to collapse from below, forcing the defenders to be wary not only of what they saw, but also of the ground that silently betrayed them.