The Snowy Night Assault on Caizhou

The Resolve to Reunify

Emperor Xianzong of Tang, supported by capable chancellors like Du Huangchang, Li Jifu, Wu Yuanheng, and Pei Du, initiated a series of reforms to strengthen the empire. They compiled essential records such as theYuanhe National Account Book and theYuanhe Gazetteer, clarifying the nation’s economic and geographic status. However, they recognized that true prosperity was impossible while regional warlords (Jiedushi) maintained semi-independent fiefdoms. Early campaigns saw mixed results: the rebellion of Liu Pi in Xichuan was swiftly crushed, but the expedition against Wang Chengzong in Chengde failed due to the incompetence of the eunuch commander Tuwu Chengcui, forcing a humiliating compromise. A turning point occurred in Weibo, where the military installed the loyalist Tian Hongzheng (formerly Tian Xing), securing the northern flank and allowing the court to focus on the most entrenched rebel stronghold: Huaixi.

Assassination in the Capital and the Appointment of Li Su

The Huaixi warlord Wu Yuanji, succeeding his father without imperial approval, launched a brutal campaign of expansion and terror. When Chancellor Wu Yuanheng firmly rejected peace overtures from allied warlords Li Shidao and Wang Chengzong, he was assassinated in broad daylight by hired killers in Chang’an. Shortly after, Chancellor Pei Du survived a similar attempt. These acts of terrorism, orchestrated by Li Shidao to halt the central government’s campaign, only hardened Emperor Xianzong’s resolve. He appointed Pei Du to oversee the war effort and transferred the talented general Li Su, son of the famous Li Sheng, to the front.

Upon arriving at Tangzhou, Li Su adopted a strategy of deception. He feigned cowardice and incompetence, focusing solely on improving the soldiers’ welfare to boost morale while lulling Wu Yuanji into a false sense of security. This approach allowed him to avoid direct confrontation with the formidable rebel general Dong Chongzhi at Huiqu. Instead, Li Su captured the rebel officer Ding Shiliang and, rather than executing him, treated him with respect and recruited him. This act of clemency sparked a wave of defections, including key generals Li You and Li Zhongyi, who provided crucial intelligence on Caizhou’s weak defenses. Despite suspicions from court eunuchs regarding Li You’s loyalty, Li Su vouched for him, and Emperor Xianzong trusted his general’s judgment.

Pei Du’s Arrival and the Removal of Eunuch Interference

As the war dragged on, voices in the court suggested abandoning the campaign. Pei Du vehemently opposed this, volunteering to go to the front himself with a vow not to return unless victorious. Emperor Xianzong granted him full authority. Upon arrival, Pei Du identified a critical bottleneck: eunuch military supervisors who interfered with command decisions despite lacking military knowledge. He successfully petitioned the emperor to remove these supervisors, liberating the generals to operate with professional autonomy. With logistics secured and command unified, Li Su presented his bold plan for a surprise attack on Caizhou, which Pei Du fully endorsed.

The Miracle of the Snowy Night

In the early winter of 817 AD, Li Su launched his decisive campaign. Ignoring superstitions about an inauspicious day for departure, he led his troops to capture Wufang, catching the rebels off guard. Seizing the momentum, Li Su decided on a direct strike against Caizhou itself. He divided his force into three columns, with defectors Li You and Li Zhongyi leading the vanguard. As they marched, the weather turned severe; a freezing rain evolved into a blizzard with snowflakes as large as goose feathers. The extreme cold and whiteout conditions, while torturous for the soldiers, provided perfect cover. Li Su rallied his men, reminding them that the rebels would never expect an attack in such weather, as no imperial army had reached Caizhou in over thirty years.

Marching over a hundred li through the night, the Tang army arrived at Caizhou under the cover of darkness. The rebel guards were asleep. Li You and Li Zhongyi scaled the walls silently, neutralizing the watchmen and keeping the alarm bells silent. By dawn, the imperial troops had surrounded Wu Yuanji’s residence. Woken by the commotion, Wu Yuanji initially dismissed it as soldiers fetching winter clothes, only to realize too late that he was completely trapped. With no escape, he surrendered.

The Collapse of Rebellion and the Yuanhe Restoration

Li Su immediately secured the families of the rebel commanders, sending Dong Chongzhi’s son to persuade his father to surrender. Dong Chongzhi, realizing resistance was futile and grateful for the protection of his family, surrendered his massive force at Huiqu without a fight. The fall of Huaixi sent shockwaves through the other warlords. Li Shidao was defeated and killed by Tian Hongzheng; Wang Chengzong submitted and ceded territory. The decades-long fragmentation of the empire was temporarily healed, ushering in the celebrated “Yuanhe Restoration.” The daring “Snowy Night Assault on Caizhou” became a legend, immortalized by poets like Liu Yuxi, who wrote of the general descending like a celestial hero to shatter the gates of treason.