Why Romans Were Such a Powerful Military Force

"Soldiers!! Take your stand! Shields up, formation tight!"

And just like that, the voice echoed throughout the woods. 10,000 Roman spears were ready to face the upcoming assault. On the horizon, they could see a massive force of Queen Boudicca of the Iceni tribe of Britons. Early scout reports predicted a force of 100,000 men.

The Roman side was commanded by Gaius Suetonius Paulinus, who managed to regroup with his 10,000 troops. The situation was tense, due to a massive rebellion led by Queen Boudicca. Although, honestly, it was Roman politics that made the situation so dire. Rome had literally backstabbed the Iceni tribe and Queen Boudicca while capturing their lands and bringing havoc. This enraged the enemy to another extent, and they were ready to destroy the Romans.

A massive enemy force was gathered under her banner. Multiple tribes came under her command who wanted to take revenge on the Romans. With the help of this massive force, she burned Roman settlements of Camulodunum (Colchester) and Londinium (London) and massacred thousands of Roman settlers. Their aim was simple: wipe out Romans from their land and take control of it. But sadly, they were up against the mightiest civilization of Europe.

The table was set and Romans prepared to face this raging elephant. The battlefield was chosen by the Romans, and to get the maximum advantage, they chose a narrow defile with woods at their rear. Against a 1:10 ratio of their forces against the enemy, they had to fight with the highest level of discipline and stay within formation. Romans had something unique which their enemy did not. Was it a holy sword? An elephant unit? Or maybe some sort of cavalry hidden in the forest to maul the enemy?

Nope. They had rectangular shields, also known as the famous Roman Scutum shields.

These shields were tall, curved rectangles (approx. 100 × 70 cm) with a central boss (metal knob). The biggest advantage was their size and shape. Unlike normal circular shields common at that time, Roman shields were massive and could cover most of the body. Thanks to the shape of a rectangle, which mimics the human body's rectangular form, they were able to cover soldiers from head to toe. Plus, when standing in formation, side by side with fellow soldiers, they could cover all the gaps.

Not only side gaps, these shields could cover the heads of soldiers too, protecting them from incoming enemy arrows. Combining these shields and tactics, the Romans created the famous Testudo (Tortoise) Formation. In this formation, the soldiers aligned in rows and columns, while their shields were at the front, sides, and top, like a box or a fort made of humans.

These rectangular shields allowed perfect tessellation, fitting together with no gaps.

The field was set, and everyone was ready. The battlefield was somewhere along Watling Street, a Roman road (exact spot unknown). The enemy attacked with their sheer numbers, but thanks to the narrow defile and woods at the rear, Romans forced them to engage head-on, while the narrow path suppressed the advantage of their numerical superiority.

Now it was like a sea of humans colliding against a wall of Roman legionaries, and thanks to their rectangular shield walls, they were stopped from any breakthrough in their formation. Romans started showering arrows and javelins from behind their shield walls and inflicted massive damage on the enemy. Their tight tortoise formation combined with huge spears and lancers made it impossible for the enemy to cause any major damage.

The enemy tried to bring them down using their archers, but thanks to the rectangular shields covering their heads, it was useless. It was like a modern tank, protected from all sides. This created such a massive psychological effect on the enemy that their morale started breaking down.

And lo and behold, this formation started to move forward. Now, it was time to counterattack. The Romans defeated this massive force brutally. According to sources, Briton casualties were nearly 80,000 (including combatants and camp followers), while Romans suffered a casualty of just 400 soldiers.

So as you can see, how such a tight formation and use of a shield wall even negated the advantage of a 1:10 superiority.

A rectangle may look common, but this shape changed the history of Europe and the world forever...