The Battle of Caizhou: Zhao Zong Holds an Isolated City with 6,000 Troops, Repelling Tens of Thousands of Jin Armies

Brief Introduction

The Battle of Caizhou was a pivotal defensive engagement in the early Southern Song Dynasty's war against the Jin. It took place in the fourth year of the Shaoxing era (1134 AD). At that time, the Jin army invaded the south again, intending to recapture the Central Plains. Caizhou (present-day Runan, Henan Province), situated north of the Huai River and holding immense strategic importance, became a key battleground. Surrounded by tens of thousands of Jin troops, Southern Song general Zhao Zong held Caizhou with only 6,000 soldiers. Relying on solid fortifications, strict discipline, and unyielding will, he successfully withstood multiple fierce attacks by the Jin forces, ultimately forcing them to retreat in defeat. This battle not only shattered the myth of the Jin army's invincibility but also bought precious time for the Southern Song's Jiang-Huai defense line. It stands as one of the exemplary cases of city defense in the early Southern Song recorded in the Xuzi Zhitong Jian (Chronicle of the Continuation of the Comprehensive Mirror for Aid in Governance).

Core Knowledge Points

1. Disparity in Troop Numbers and Defensive Strategy

The most striking feature of the Battle of Caizhou was its extreme defensive strategy against overwhelming odds. Zhao Zong commanded 6,000 garrison troops but faced tens of thousands of Jin cavalry and infantry. Zhao did not adopt mobile field tactics; instead, he employed a classic strategy of "strengthening fortifications, scorched earth, and holding out for reinforcements." Leveraging the advantage of Caizhou's sturdy walls, he established layered defenses to exhaust the enemy's momentum.

2. Command and Morale

According to the Xuzi Zhitong Jian, during the critical moment when the city's fall seemed imminent, Zhao Zong personally climbed onto the walls to supervise the battle, leading by example and greatly stabilizing the troops' morale. In contrast, the Jin army, suffering from heavy casualties, prolonged stalemate, and overly long supply lines, chose to withdraw as their morale collapsed. This process highlights the operational model of Southern Song generals: relying on organization and willpower to compensate for inferior troop strength.

3. Strategic Significance

Caizhou served as a crucial hub between the Yangtze and Huai rivers. If Caizhou had fallen, the Jin army could have directly threatened the Huainan region, and even the hinterland of Jiangnan. Zhao Zong’s successful defense effectively acted as a "little lever moving a great weight," checking the Jin's southward advance and buying time for the Southern Song court to adjust deployments and gather reinforcements.

Connection to the Xuzi Zhitong Jian

The Xuzi Zhitong Jian (compiled by Bi Yuan and others) records this history in detail. In the book, this battle is placed against the backdrop of the protracted stalemate between the Southern Song and the Jin.

* Contextual Background: Earlier sections of the book often describe active offensive campaigns, such as Yue Fei's northern expeditions and Wu Xue's Battle of Shangyuan. In contrast, the Battle of Caizhou represents the passive defense characteristic of the Southern Song's strategic holding phase. It reflects how the Southern Song was still at a disadvantage in terms of troop size, equipment, and mobility at the time, requiring reliance on fortified cities to maintain the defense line.
Historians' Commentary: When recording Zhao Zong’s defense of Caizhou, the Xuzi Zhitong Jian* emphasizes the "merit of holding the city." This resonates with the internal debates within the Song court between war-hawks and pacifists, proving that even during periods of high calls for peace talks, the front-line generals' steadfastness remained the foundation of national security.
* Subsequent Impact: Later sections of the book continue to record the cycles of negotiation and rupture between the Song and Jin. Although the victory at Caizhou did not alter the格局 (configuration) of the Southern Song holding only half the country, it greatly boosted the anti-invasion confidence of the southern military and civilian population on a psychological level, becoming a classic case cited by Song people to argue that "guarding the territory is a duty."

Conclusion

Although the Battle of Caizhou did not ultimately determine the north-south power balance, it vividly illustrates the defensive military wisdom that "fortified cities are as solid as gold and bronze, and public heart is the barrier." The story of Zhao Zong repelling tens of thousands of enemies with just 6,000 troops is not only a classic in military history but also a microcosm of the indomitable spirit of the Chinese nation. Through the records in the Xuzi Zhitong Jian, we can glimpse the historical details of how the early Southern Song held its bottom line and turned the tide amidst extreme adversity.