When Sun Yat Sen declared the Republic of China on October 10, 1911, China embarked on 40 years of internal struggle and civil war. Warlords quickly took over sections of the country and ruled them as individual fiefdoms. Fifteen years later, in 1926, Chiang Kai Shek took control of the Kuomintang Party (as it was known in the West,) and the Army. He began a campaign to overthrow them. He was allied with the Communist Chinese until the conquest of Shanghai.