How the Mongol Army Actually Fought

Every Mongol soldier belonged to a unit of ten, called an arban. Ten arbans made a company of a hundred, ten of those made a thousand, and ten thousands made a division called a tumen. Each level had its own commander who answered up the chain, so a general could send one signal and have ten thousand riders turn, split, or regroup together. This is what let Mongol armies execute maneuvers that looked chaotic but were actually precise, because control existed at every scale instead of just at the top.

That control made the feigned retreat possible. A Mongol unit would engage an enemy line, then break and flee as if routed. Disciplined infantry and cavalry almost always gave chase, because a wavering enemy is exactly when you press the advantage, and chasing them meant pulling tight formations apart into a strung-out column. The fleeing Mongols, still coordinated through their chain of command, would wheel back together and meet fresh reserves waiting on the flanks, now facing an enemy that had dissolved its own strength by pursuing. It worked against Chinese dynastic armies, Khwarazmian garrisons, and European knights alike because it did not depend on what the enemy was, only on how organized armies instinctively chase a broken line.

Mongol horse archers added range and speed: their composite bows outshot European crossbows and could be fired from a moving horse, so Mongols could hurt an enemy long before that enemy closed the distance. All of this depended on open ground, where cavalry could maneuver and see. Thick jungle, mountain passes, and naval warfare erased these advantages, which is exactly why Mongol campaigns stalled against Vietnam and failed to conquer Japan.