In 1618, Nurhaci announced his Seven Grievances (Ma. nadan koro; Chinese qi da hen 七大恨), effectively declaring war against the Ming dynasty, and starting the Manchu conquest. His troops forced their way into Fushun and obtained the surrender of the city's commander Li Yongfang (d. 1634).
In retaliation, a year later, a Ming punitive force of about 100,000 men, which included Korean and Yehe troops, approached Nurhaci's Manchus along four different routes. After scoring successive victories, the most famous one near the town of Sarhu, the Manchus went on to seize
Manchus have been largely assimilated by the surrounding Han Chinese and the Manchu language is almost extinct, being spoken only among a small number of elderly people.
The Manchu language is a member of the Tungusic language family, itself a member of the putative Altaic language group, and is hypothetically related to Korean, Mongolian and Turkic languages.
Written Manchu, however, was still used for the keeping of records and communication between the emperor and the Banner officials until the collapse of the dynasty.