Gwanggyosan Was Actually One of Joseon's Worst Battlefields

If you're from Yongin, chances are you've hiked Gwanggyosan at least once. Lacing up your hiking boots tight on a weekend morning, snapping a photo in front of the summit marker, then coming down for pajeon and a bowl of makgeolli. You know this route so well you could probably draw it with your eyes closed, right? But did you know that beneath that familiar ridge lies the memory of one of Joseon's most painful defeats, from 434 years ago? Today, Yong-i wants to dig up the real history quietly buried under that hiking trail. By the time you finish reading, your steps up Gwanggyosan will feel just a little different.

That Ridge Turned Out to Be a Battlefield

It was 1592, the very year the Imjin War broke out. As Japanese forces swept northward and quickly seized Hanseong—today's Seoul—resistance movements to reclaim the nation sprang up like wildfire across the country. Among them, the largest was the Righteous Relief Army gathered from three provinces: Jeolla, Chungcheong, and Gyeongsang, known as the Sam-do Geunwanggun. Commanded by Yi Gwang and others, this army is said to have numbered in the tens of thousands. Let's imagine it for a moment: on the very mountain path we now climb slowly with hiking poles in hand, tens of thousands of soldiers were marching north, driven by a single goal—retaking Hanseong. Picturing the sound of their footsteps and the tension that must have filled the air, soaking into this mountainside somewhere, gives you an odd feeling.

But standing in the way of this massive Joseon army was a far smaller force led by the Japanese general Wakizaka Yasuharu. Judging by numbers alone, it should have been no contest. Yet the outcome was the exact opposite. The Sam-do Geunwanggun suffered a crushing defeat in this battle. Recorded in the Annals of King Seonjo and other historical sources, this clash is known as the Battle of Yongin—one of the largest defeats Joseon forces suffered in the early stages of the Imjin War. And it happened right here, in our own neighborhood.

Why Tens of Thousands of Troops Collapsed

Looking at the numbers alone, the outcome makes no sense—tens of thousands crumbling before a far smaller force. But war, it turns out, isn't always a numbers game. A chain of command that never quite meshed among troops hastily gathered from different regions, soldiers already exhausted from the long march, and an enemy that struck precisely at that weak point—all of it combined to send the massive army reeling and collapsing in an instant. The exact sequence of events and the precise location of the fighting vary somewhat from one historical record to another, so it's hard to state with certainty. But one thing is clear: for Joseon, this was a defeat that stung for a long time to come. And the stage where that defeat unfolded is this very mountain we climb every weekend.

This defeat wasn't just a single lost battle. It's said to have significantly shaken Joseon's plans to retake Hanseong and had a considerable impact on the overall course of the early Imjin War. That's how significant the Battle of Yongin was, both in scale and in its aftermath—something well worth remembering. Yet haven't we all simply walked past this site, knowing it only as a familiar hiking course? Climbing up and down every week without ever realizing the history laid beneath our feet. Once you learn that the battle you only skimmed past in a few textbook lines actually took place in your own neighborhood, on the very mountain you climb again and again, doesn't history suddenly feel much closer?

Where the Battle Was Fought, There's Now a Hiking Trail

The main battleground of the Battle of Yongin is generally believed to be around today's Gwanggyosan. Exactly which ridge or valley it was, though, varies slightly across historical records, so it's hard to point to one exact spot and say "here it is." Still, one thing is certain: the mountain we climb every weekend, catching our breath along the way, was once the very ground where tens of thousands of men fought with the nation's fate on the line, 434 years ago. The feel of the soil underfoot and the view from the ridge remain the same, but the weight of time layered on top of it feels entirely different. The next time you climb Gwanggyosan, each ridge in front of you might just look a little different.

🐉 Real Photos, via Yongi