THE KOREAN TODAY
History Lives On
The Silla Chronicle
Episode 15: The Conquest of Baekje – The Victory of 660
When a smaller kingdom borrows the strength of a distant empire, the fate of a state seven centuries old can be settled in a matter of days.
In 660 CE, the Korean kingdom of Silla joined forces with Tang China to destroy its neighbor Baekje. A Tang armada crossed the Yellow Sea from the Shandong Peninsula while a Silla army marched overland from the southeast. The two forces converged on Baekje’s capital, Sabi, in a coordinated pincer. For students of coalition warfare, it remains a textbook case.
Yet the victory raises a hard question that Western readers will recognize: was this alliance a masterstroke, or a bargain with a dangerous partner, much as the Byzantines learned when they invited outside powers into their own disputes? And why does the defeated side leave us so few records?
🌍 Western Historical Parallel
In the very years Silla and Tang were moving on Baekje, the Byzantine Empire under Constans II was fighting to survive after losing Syria and Egypt to the Arab armies, and the Umayyad Caliphate was being founded in 661. In the West, the Merovingian Franks were ruled by weak kings while palace mayors held real power, and the Synod of Whitby (664) was about to align Anglo-Saxon England with Rome. Like Justinian’s reconquest of Italy a century earlier, Silla’s campaign was a war of coalition, planned over years, and carried out with a stronger ally.
◆ The Ancient Landscape
In 642, Baekje’s King Uija seized some forty Silla fortresses, including Daeya Fortress (near modern Hapcheon), where Kim Pumseok, son-in-law of Kim Chunchu, died with his wife. Kim Chunchu, later King Muyeol, swore revenge and traveled to Goguryeo, Japan, and finally Tang China to find an ally. A military pact with Emperor Taizong took shape around 648.
In 660, Emperor Gaozong of Tang gave General Su Dingfang about 130,000 troops to attack Baekje by sea. King Muyeol sent a Silla army of about 50,000 overland under Kim Yu-sin. The Tang fleet met Silla’s navy, led by Crown Prince Kim Beopmin (the future King Munmu), at Deokmul Island off the west coast, and then advanced to the Geum River estuary and on toward Sabi.
“Gyebaek killed his own wife and children, saying: ‘Facing the combined armies of Tang and Silla, I cannot know whether our country will survive. I fear my family would be taken captive and made slaves.'” (paraphrased)
◆ Same Era, Different Worlds
🏛️ China
Tang under Emperor Gaozong, having broken the Western Turks, turned east and used Baekje as a route to squeeze Goguryeo.
🗿 Byzantine Empire
Constans II ruled a shrunken empire, still reeling from the loss of its richest provinces to Arab conquest after Heraclius’s era.
⚔️ Western Europe
Frankish kingdoms were fragmented under Merovingian kings; Anglo-Saxon kingdoms were competing and converting.
🕌 Islamic World
The Rashidun caliphate gave way to the Umayyad dynasty in 661, with Arab armies pushing east and west.
[Image: Schematic of the Silla-Tang pincer on Baekje, 660 CE (locations approximate)]
⚔️ Scene from That Day
“On the plain of Hwangsanbeol, Gyebaek’s five thousand desperate men, arrayed in three camps, threw back the Silla host of fifty thousand four times. It was a fight no tally of numbers could win. Then, from the Silla lines, a sixteen-year-old Hwarang cadet named Gwanchang spurred his horse forward alone.”
“Gyebaek captured the boy, admired his courage, and sent him back alive. Gwanchang charged again, was captured again, and this time was beheaded; his head came back tied to his saddle. His father, General Pumil, lifted it and said the face looked alive, and that his son had been lucky to die for his king. The Silla ranks surged forward in a fury, much like the cry that carried Roman legions after a fallen standard-bearer.”
◆ Uncovering Historical Truth
According to the Samguk Sagi, the Battle of Hwangsanbeol took place on the ninth day of the seventh lunar month, in modern Nonsan. Kim Yu-sin’s Silla army overcame Gyebaek’s roughly 5,000 men. Meanwhile Su Dingfang’s Tang force had landed at the Geum River estuary and driven toward Sabi. Timing was everything: like a Roman consul coordinating separate legions, the allies had to arrive together or not at all. Tradition holds that Silla’s army arrived late and was rebuked by the Tang commander, which shows how fragile a two-army plan could be.
On the eighteenth day of the same lunar month, King Uija surrendered at Ungjin (modern Gongju), and Sabi’s defenses collapsed. The Tang took the king, the crown prince, officials, and some 12,000 people to China. Su Dingfang had a commemorative inscription carved on the five-story stone pagoda at the Jeongnimsa temple site in Buyeo, which still stands. It is among the most tangible archaeological witnesses to Baekje’s last capital, and part of a UNESCO World Heritage site since 2015.
Yet the fall of the capital did not end Baekje at once. Bokshin and Dochim raised a restoration movement with Japanese support, and it collapsed only after the Battle of Baekgang in 663. Silla’s alliance with Tang succeeded, but led, after Goguryeo’s fall in 668, to years of war to drive Tang troops from the peninsula. An alliance system resembling feudal bonds of obligation, rather than centralized empire, would have been easier to loosen; here the stronger partner had to be fought.
Period
Mid-7th century CE (660)
Key Figures
King Muyeol, Kim Yu-sin, Su Dingfang, Gyebaek, King Uija
Forces
Tang ~130,000 and Silla ~50,000 vs. Baekje’s field force of ~5,000 at Hwangsanbeol (traditional figures)
Outcome
End of Baekje’s capital; first step toward unification
🔍 International Academic Perspectives
Korean/Asian Scholars
The standard view dates Baekje’s fall to 660, when Sabi fell and Uija surrendered. Some Korean scholars argue for 663, when the restoration movement was crushed, and note that the surviving record comes from Silla, the victor, which may distort troop numbers and causes of the fall.
Western Historians
English-language surveys generally describe 660 as the conquest of Baekje by a Silla-Tang coalition and read it within Tang’s wider strategy against Goguryeo, comparable to how scholars treat Justinian’s wars as imperial strategy as much as local conflict.
📖 Key Terms Explained
- Silla (新羅)
- Ancient Korean kingdom (traditionally 57 BCE – 935 CE), one of the Three Kingdoms and the eventual unifier of most of the peninsula
- Baekje (百濟)
- Kingdom in the southwest of the peninsula (traditionally 18 BCE – 660 CE), known for refined Buddhist art and close ties with Japan
- Hwarang (花郎)
- “Flower youth,” an elite Silla order of young warriors, loosely comparable to medieval knightly orders
- Tang Dynasty
- Chinese empire (618-907 CE), contemporary with the Byzantine Empire and the early Caliphates
◆ Lessons for Today’s World
The campaign of 660 shows that a coalition succeeds when partners share an objective and synchronize their timing. Silla divided the roles: a land assault and an amphibious landing that broke Baekje’s defense at once. Modern alliances such as NATO rely on the same logic of joint planning and combined exercises.
But an alliance lends strength at a price. Silla had to confront its own ally over the peninsula after victory, as European states in later centuries found when coalition partners had different aims for the postwar order. Winning together is not the same as agreeing on what comes next.
| Aspect | Silla Era | Modern Parallel |
|---|---|---|
| Geopolitics | Military pact with Tang amid Baekje and Goguryeo pressure | Alliances balancing great-power competition (US, China, Russia) |
| Military | Synchronized land and sea pincer | Combined exercises and joint command, deterrence |
| Culture | Hwarang martial ethos, Buddhist-Confucian blend | K-Culture and K-Defense global influence |
[Image: From an ancient coalition to modern Korea’s alliance system]
📚 Diving Deeper
- Visit the Baekje Historic Areas (UNESCO, 2015), including the Jeongnimsa site in Buyeo with the pagoda carved by Su Dingfang.
- Baekje’s royal tomb of King Muryeong in Gongju, found intact in 1971, is often compared to Sutton Hoo for the richness of its burial goods.
- For further reading, see the Samguk Sagi accounts of King Muyeol, Gyebaek, and Gwanchang, and the coverage of Korea’s Three Kingdoms in the Cambridge History of China and general surveys of early Korea.
The Voice of Living History
The victory of 660 opened the road to unification for Silla, but that road led through a new war. Those who win must prepare for the next struggle from the first day, and the memory of the defeated remains part of history too.
“The wind over Hwangsanbeol calls the victor and the vanquished by the same name – the spirit of Silla endures.”
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Episode 14: Kim Yu-sin – Hero of Unification
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Episode 16: The Conquest of Goguryeo – The Fall of Pyongyang in 668
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