On April 11, 1241, Hungarian soldiers lined up along the haphazardly fortified banks of the Hernad and Sajo rivers to await the arrival of the Mongols.
Although the Hungarians’ numbers were vastly superior, the odds were stacked in favor of their opponent. The “Mongol storm” had been raging through Central Asia and Eastern Europe for roughly two decades at this point, swallowing up the Khwarazmian Empire in modern-day Afghanistan, the principalities of Kievan Rus’, and, most recently, the Kingdom of Poland.
Thanks in part to their unrivaled horsemanship and archery skills — Mongolian bows were lighter, faster, and more precise than their European counterparts — the Mongols plowed through armies many times their size, and Hungary proved no exception.
The lines at Sajo and Hernad were breached, cities burned to the ground, crops and livestock confiscated, and an estimated 25% of all Hungarians slaughtered.
The Hungarian king, Béla IV, fled to the Dalmatian coast, which was part of Croatia at the time, where he and his kingdom would have surely been crushed were it not for Ogodei Khan, whose sudden death later that year compelled Mongol forces everywhere to return home to elect a new leader.
The Mongol invasion of Europe, left unfinished, left its mark on the survivors.
“The entire precious kingdom,” the Holy Roman Emperor Frederick II wrote of Hungary, “was depopulated, devastated and turned into a barren wasteland.”
The invasion is also believed to have facilitated the spread of the bubonic plague, leading to the deaths of up to 200 million people worldwide.
But while the crimes and casualties of Mongol conquest are too great to count, so, too, are the downstream effects it had on the development of civilization.
Poland, Hungary, and particularly Russia bounced back stronger, building the foundation for nation-states that are still around today.
With the lands of Asia united under a single ruler, ideas and inventions could travel more freely and safely from one end of the world to another.
In a weird way, the Mongols even had a hand in events as distant as Vladimir Putin’s invasion of Ukraine.