stylistic:tone
Claiming the Mandate of Heaven

Hong Taiji died suddenly in September 1643. As the Jurchens had traditionally "elected" their leader through a council of nobles, the Qing state did not have a clear succession system. The leading contenders for power were Hong Taiji's oldest son Hooge and Hong Taiji's half brother Dorgon. A compromise installed Hong Taiji's five-year-old son, Fulin, as the Shunzhi Emperor, with Dorgon as regent and de facto leader of the Manchu nation.

Meanwhile, Ming government officials fought against each other, against fiscal collapse, and against a series of peasant rebellions. They were unable to capitalise on the Manchu succession dispute and the presence of a minor as emperor. In April 1644, the capital, Beijing, was sacked by a coalition of rebel forces led by Li Zicheng, a former minor Ming official, who established a short-lived Shun dynasty. The last Ming ruler, the Chongzhen Emperor, committed suicide when the city fell to the rebels, marking the official end of the dynasty.

Li Zicheng then led rebel forces numbering some 200,000 to confront Wu Sangui, at Shanhai Pass, a key pass of the Great Wall, which defended the capital. Wu Sangui, caught between a Chinese rebel army twice his size and a foreign enemy he had fought for years, cast his lot with the familiar Manchus. Wu Sangui may have been influenced by Li Zicheng's mistreatment of wealthy and cultured officials, including Li's own family; it was said that Li took Wu's concubine Chen Yuanyuan for himself. Wu and Dorgon allied in the name of avenging the death of the Chongzhen Emperor. Together, the two former enemies met and defeated Li Zicheng's rebel forces in battle on May 27, 1644.

The newly allied armies captured Beijing on 6 June. The Shunzhi Emperor was invested as the " Son of Heaven " on 30 October. The Manchus, who had positioned themselves as political heirs to the Ming emperor by defeating Li Zicheng, completed the symbolic transition by holding a formal funeral for the Chongzhen Emperor. However, conquering the rest of China Proper took another seventeen years of battling Ming loyalists, pretenders and rebels. The last Ming pretender, Prince Gui, sought refuge with the King of Burma, Pindale Min, but was turned over to a Qing expeditionary army commanded by Wu Sangui, who had him brought back to Yunnan province and executed in early 1662.

The Qing had taken shrewd advantage of Ming civilian government discrimination against the military and encouraged the Ming military to defect by spreading the message that the Manchus valued their skills. Banners made up of Han Chinese who defected before 1644 were classed among the Eight Banners, giving them social and legal privileges. Han defectors swelled the ranks of the Eight Banners so greatly that ethnic Manchus became a minority – only 16% in 1648, with Han Bannermen dominating at 75% and Mongol Bannermen making up the rest. Gunpowder weapons like muskets and artillery were wielded by the Chinese Banners. Normally, Han Chinese defector troops were deployed as the vanguard, while Manchu Bannermen were used predominantly for quick strikes with maximum impact, so as to minimize ethnic Manchu losses.

This multi-ethnic force conquered Ming China for the Qing. The three Liaodong Han Bannermen officers who played key roles in the conquest of southern China were Shang Kexi, Geng Zhongming, and Kong Youde, who governed southern China autonomously as viceroys for the Qing after the conquest. Han Chinese Bannermen made up the majority of governors in the early Qing, stabilizing Qing rule. To promote ethnic harmony, a 1648 decree allowed Han Chinese civilian men to marry Manchu women from the Banners with the permission of the Board of Revenue if they were registered daughters of officials or commoners, or with the permission of their banner company captain if they were unregistered commoners. Later in the dynasty the policies allowing intermarriage were done away with.

The first seven years of the young Shunzhi Emperor's reign were dominated by Dorgon's regency. Because of his own political insecurity, Dorgon followed Hong Taiji's example by ruling in the name of the emperor at the expense of rival Manchu princes, many of whom he demoted or imprisoned. Dorgon's precedents and example cast a long shadow. First, the Manchus had entered "South of the Wall" because Dorgon had responded decisively to Wu Sangui's appeal, then, instead of sacking Beijing as the rebels had done, Dorgon insisted, over the protests of other Manchu princes, on making it the dynastic capital and reappointing most Ming officials. No major Chinese dynasty had directly taken over its immediate predecessor's capital, but keeping the Ming capital and bureaucracy intact helped quickly stabilize the regime and sped up the conquest of the rest of the country. Dorgon then drastically reduced the influence of the eunuchs and directed Manchu women not to bind their feet in the Chinese style.

However, not all of Dorgon's policies were equally popular or as easy to implement. The controversial July 1645 edict (the " haircutting order ") forced adult Han Chinese men to shave the front of their heads and comb the remaining hair into the queue hairstyle which was worn by Manchu men, on pain of death. The popular description of the order was: "To keep the hair, you lose the head; To keep your head, you cut the hair." To the Manchus, this policy was a test of loyalty and an aid in distinguishing friend from foe. For the Han Chinese, however, it was a humiliating reminder of Qing authority that challenged traditional Confucian values. The order triggered strong resistance in Jiangnan. In the ensuing unrest, some 100,000 Han were slaughtered.

On 31 December 1650, Dorgon died suddenly, marking the start of the Shunzhi Emperor's personal rule. Because the emperor was only 12 years old at that time, most decisions were made on his behalf by his mother, Empress Dowager Xiaozhuang, who turned out to be a skilled political operator. Although his support had been essential to Shunzhi's ascent, Dorgon had centralised so much power in his hands as to become a direct threat to the throne. So much so that upon his death he was bestowed the extraordinary posthumous title of Emperor Yi (義皇帝), the only instance in Qing history in which a Manchu " prince of the blood " (親王) was so honored. Two months into Shunzhi's personal rule, however, Dorgon was not only stripped of his titles, but his corpse was disinterred and mutilated. Dorgon's fall from grace also led to the purge of his family and associates at court. Shunzhi's promising start was cut short by his early death in 1661 at the age of 24 from smallpox. He was succeeded by his third son Xuanye, who reigned as the Kangxi Emperor.

The Manchus sent Han Bannermen to fight against Koxinga's Ming loyalists in Fujian. They removed the population from coastal areas in order to deprive Koxinga's Ming loyalists of resources. This led to a misunderstanding that Manchus were "afraid of water". Han Bannermen carried out the fighting and killing, casting doubt on the claim that fear of the water led to the coastal evacuation and ban on maritime activities. Even though a poem refers to the soldiers carrying out massacres in Fujian as "barbarians", both Han Green Standard Army and Han Bannermen were involved and carried out the worst slaughter. 400,000 Green Standard Army soldiers were used against the Three Feudatories in addition to the 200,000 Bannermen.