Chang Hsien Chung

The total population of late-Ming China was much less than 150 million people, so either you misread or the author is a raving mad lunatic.

Chang Hsien Chung's reputation amongst contemporary historians is not too bad, simply a rebel leader forced to raise the flags because of a corrupt government that failed to provide for the mass of poor peasants

Chang Hsien Chung's rebel army was unable to resist the invading Manchu army, led by Duoduo (brother of Dorgun and grandson of Nurachi) and by Wu Sangui (ex-Ming general who allied with Manchus).

Chang had two famous adopted sons who, after the death of Chang, joined forces with the Southern Ming against the Manchus.

1, Sun Kewang, who surrendered to the Manchus in Changsha. 

2, Li Dingguo, who refused to surrender to the Manchus, even after the Southern Ming Emperor was captured and executed by Wu Sanggui.  Li Dingguo then transferred his remaining troops across the border to Myanmar(Burma), where his men continued to resist Manchus. 

Sun Kewang and Li Dingguo did not see eye to eye, and Sun, jealous of Li's military achievements and status within the Southern Ming, decided to switch banners and aid the Manchus.  Li Dingguo, on the other hand, essentially became the only military force, other than Koxinga, with the ability to defeat the Manchus.  Li recaptured Changsha and almost staged a revival of the Ming in Southern China, but weak Ming Emperors and internal feuds by Southern Ming court officials sealed the fate of Li's campaign.

Historians tend to praise Li Dingguo for his stubborn resistance efforts.   At his deathbed,  Li made his son and remaining troops promise never to surrender to the Manchus.