Securing the West and the North
Upon ascending the throne, Emperor Gaozu of Tang found himself ruling a fragmented empire. Numerous warlords had declared themselves emperors, and true sovereignty required their subjugation. The immediate threat in the west was Xue Ju, the self-proclaimed emperor of Jincheng (modern Lanzhou). Although Xue Ju died of illness, his son Xue Rengao continued the aggression. Li Shimin, recently recovered from malaria, was appointed commander of the western expedition. Adopting a strategy of attrition, he fortified his camps and refused battle until the enemy’s supplies were exhausted and morale crumbled. He then led a elite force to strike, forcing Xue Rengao to surrender. Simultaneously, the rebel Li Gui in Hexi (Wuwei) was persuaded to submit; when he resisted, Tang agents incited his own subordinates to capture him, ending his short-lived regime.
While the west stabilized, disaster struck in the north. Liu Wuzhou, a former Sui officer who had rebelled in Mayi, launched a fierce assault on Taiyuan. Li Yuanji, the Prince of Qi and guardian of Taiyuan, fled in panic to Chang’an, abandoning the city. Emperor Gaozu, despairing, suggested abandoning the Hedong region entirely. Li Shimin vehemently opposed this, arguing that Taiyuan was the foundation of their dynasty and Hedong a vital resource base. Volunteering to lead just 30,000 troops, Li Shimin marched east.
At Meiliang River, Li Shimin encountered Yuchi Jingde, a formidable general serving under Liu Wuzhou’s commander Song Jin’gang. Despite Yuchi’s prowess in single combat, Li Shimin outmaneuvered him with ambushes. The Tang army’s morale soared as they pursued the enemy to Quechu Valley, engaging Song Jin’gang’s forces in eight battles in a single day. Impressed by Li Shimin’s leadership and recognizing the futility of serving Liu Wuzhou, Yuchi Jingde surrendered. Song Jin’gang and Liu Wuzhou fled north to the Turks, only to be killed by their hosts. With Taiyuan reclaimed, the Tang secured both Guanzhong and Hedong, eliminating threats on their flanks.
The Struggle for Luoyang and the Fall of Li Mi
With the north and west secure, Emperor Gaozu turned his eyes east toward Luoyang, appointing Li Shimin to lead the campaign. Meanwhile, Luoyang was the stage for a complex power struggle. Li Mi, leader of the Wagang Army, had defeated Wang Shichong repeatedly and besieged the city, controlling the strategic Jinyong Castle and the northern Mang Mountain. However, the arrival of Yuwen Huaji, the assassin of Emperor Yang of Sui, who was marching north from Jiangdu with a puppet emperor, complicated matters.
The Sui court in Luoyang, now led by the young Emperor Yang Tong, faced a dilemma. Advisor Yuan Wendu proposed a cunning strategy: grant Li Mi high titles and enlist him to defeat Yuwen Huaji. Li Mi, tempted by the prospect of legitimacy and power, accepted the title of Grand Commandant (Taiwei) and turned his forces to intercept Yuwen. At the Battle of Tong Mountain, Li Mi achieved a pyrrhic victory; while Yuwen Huaji was driven into Hebei, Li Mi’s elite troops suffered heavy casualties.
Seizing this moment of weakness, Wang Shichong orchestrated a coup within Luoyang. Fearing that Yuan Wendu’s plan would hand the city to his arch-enemy Li Mi, Wang Shichong rallied his troops, stormed the palace, and executed Yuan Wendu and his faction. Consolidating power, Wang Shichong revoked Li Mi’s titles and launched a surprise attack on the exhausted Wagang Army. Caught off guard and depleted, the once-mighty Wagang forces were shattered.
Isolated and defeated, Li Mi, accompanied only by his loyal friend Wang Bodang, decided to surrender to the Tang. Emperor Gaozu welcomed them with great ceremony in Chang’an, even marrying Li Mi to a cousin. However, the reception at court was cold; officials treated him with suspicion, and his troops went unfed. Disillusioned by his appointment as Minister of Light (a ceremonial post managing imperial meals), Li Mi requested permission to return to the east to recruit his former followers. Emperor Gaozu initially agreed but, swayed by advisors warning of rebellion, ordered Li Mi to return. Realizing he was trapped, Li Mi killed the messenger and fled. Ambushed by Tang forces in the Xiong’er Mountains, Li Mi and Wang Bodang were killed, ending the story of the great rebel leader at age thirty-six.
The Siege of Luoyang and the Capture of Dou Jiande
With Li Mi gone, Wang Shichong declared himself Emperor of Zheng. Li Shimin advanced on Luoyang, surrounding the city. Wang Shichong, desperate, sought aid from Dou Jiande, the powerful warlord of Hebei who had recently captured and executed Yuwen Huaji and declared himself Emperor of Xia. Dou Jiande, fearing Tang expansion, marched south with over 100,000 troops to relieve Luoyang, proposing a joint attack on the Tang forces.
Facing a two-front war, many Tang generals advised retreat. Li Shimin, however, was resolute: “If Luoyang is not taken, I will not withdraw!” Following the advice of advisor Xue Shou, he left a contingent to maintain the siege of Luoyang while leading his elite cavalry to intercept Dou Jiande at the strategic Hulao Pass.
At Hulao, Li Shimin employed a strategy of delay. He refused to engage Dou’s massive army in the morning, waiting until noon when the enemy soldiers were weary, hungry, and thirsty. Seizing the moment, the Tang cavalry charged, throwing Dou’s forces into chaos. Dou Jiande was wounded, captured, and later executed in Chang’an. Upon hearing of Dou’s defeat, Wang Shichong lost all hope and surrendered. Although promised safety, he was later killed by a personal enemy before he could be exiled. With the fall of these three major rivals – Li Mi, Dou Jiande, and Wang Shichong – the Central Plains were unified under Tang rule.
Pacifying the South and Final Unification
While the north was consolidated, the south remained fragmented among warlords like Du Fuwei, Shen Faxing, Li Zitong, and Chen Leng. Du Fuwei, recognizing the shifting tide, wisely surrendered to the Tang and was appointed Pacification Ambassador, actively helping to suppress the other rebels. By 621 AD, the Jianghuai region was secured.
The Tang then turned their attention to the middle Yangtze, where Xiao Xian, a descendant of the Liang royal family, held sway in Jiangling. Under the command of Prince Li Xiaogong, Tang forces swiftly defeated Xiao Xian, bringing the central river valley under control. Finally, in Lingnan (the far south), Feng Ang, the grandson of the legendary Lady Xian, faced pressure from local factions to declare independence. Remembering his grandmother’s legacy of loyalty, Feng Ang refused, stating, “My family has served the state for five generations; I cannot disgrace our ancestors.” He actively supported the Tang in pacifying the region, ensuring the south remained integrated into the empire.
With the elimination of these scattered regimes, the Tang Dynasty successfully reunified China after years of chaos. Emperor Gaozu rejoiced at the restoration of order, unaware that, like the Sui before them, his own family would soon face internal strife that would threaten the stability he had worked so hard to achieve.
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