In 1640, masses of Chinese peasants who were starving, unable to pay their taxes, and no longer in fear of the frequently defeated Chinese army, began to form into huge bands of rebels. The Chinese military, caught between fruitless efforts to defeat the Manchu raiders from the north and huge peasant revolts in the provinces, essentially fell apart. Unpaid and unfed, the army was defeated by Li Zicheng – now self-styled as the Prince of Shun – and deserted the capital without much of a fight. On 25 April 1644, Beijing fell to a rebel army led by Li Zicheng when the city gates were opened by rebel allies from within. During the turmoil, the last Ming emperor hanged himself on a tree in the imperial garden outside the Forbidden City.