The Battle of Cannae - 216 B.C
During the Second Punic War, Hannibal had already achieved the impossible by invading Italy over the Alps with a mercenary army and large company of war elephants. Next, he stunned the Mediterranean world by soundly defeating Roman Legions in two large battles on Italian soil. Now, Rome had amassed the largest army they had ever fielded in order to decisively crush Hannibal once and for all. Estimates have varied over the centuries, but there were no less than 80,000 infantry, and more than 6000 horse. This would be at least 16 legions, and was an absolutely massive number of soldiers to field.
Hannibal is estimated to have fielded approximately 40,000 infantry, and 10,000 horse. While Hannibal was distinctly stronger in cavalry, he was, at face value, significantly weaker in force composition, with most of his army being a group of non-homogenous mercenaries, including a great number of unruly and undisciplined Gauls fighting to spite Rome, not in favor of Carthaginian rule.
Hannibal was to use his enemy’s strength against them, and would turn his weakness into an asset. He positioned his Gauls in a convex formation in his center, a rather unconventional arrangement. He positioned his light horse on his right flank, and his heavy horse on his left flank. He positioned his heaviest and most reliable African heavy infantry further off on the wings in inconspicuous positions, and they did not initially engage the Romans who took no notice of them.
Hannibal, as usual, led from the center and fought side by side with his men, which was also his intentionally weakest point. After the skirmishers completed their stage of the battle and retired inconclusively, the Roman heavy infantry, the historical legionnaires, who were arranged in an unusually deep formation to accommodate their massive numbers, advanced confidently at the apparently weak Carthaginian center. As soon as the forces engaged, Hannibal led an incredibly difficult maneuver: an organized retreat while still fighting the Romans. This was planned, and slowly turned the convex into a concave, with the weight of the Roman Legions steadily pushing their way forward.
Meanwhile, the Carthaginian cavalry had steadily driven their counterparts from the battlefield, soundly winning their respective engagements. One of the Roman commanders, Paulus, was gravely wounded, but rode back to his still considerable formation of heavy infantry and led from the center there. The Gauls and other assorted light infantry continued to steadily fight backwards, with Hannibal controlling the entire battle from the center.
At this point, three things happened: the veteran heavy African infantry now moved into battle and advanced on both Roman flanks; the two groups of Carthaginian cavalry wheeled around and began to hit the Roman rear; and, as was planned by Hannibal, the afternoon sun came into perfect position to obscure the enemy infantry’s vision. A perfect symphony was just reaching its crescendo, perfectly orchestrated and executed by one of the finest military leaders in the history of the world. The most historically incredible example of double envelopment with a pincer movement was unfolding right now, much to the dismay of close to 100,000 Roman souls who now had nowhere to retreat.
The Carthaginians killed almost every one of them in what is still to this day one of the most massive slaughters of human life in one battle in the history of our species. Hannibal turned his superficially weaker, and significantly numerically smaller, force into a fearsome weapon, using even the well timed sun against his foes. Hannibal had many, many impressive victories in his undefeated time on Italian soil, but Cannae was his magnum opus without doubt. He made the plan, executed the plan from the most difficult position, and decisively defeated his stronger foe. This was also one of the few times in history a numerically weaker force performed a successful double envelopment of a stronger force.
The Battle of Cannae was nothing short of tactical brilliance and genius leadership by one of the finest military minds to have ever been born. And he also did the heavy lifting.
