History of the Republic of China
On the other hand, since the failure of the Second Revolution, Sun Yat-sen and his allies were trying to rebuild the revolutionary movement. In July 1914 Sun established the Chinese Revolutionary Party (). He felt that his failures at building a consistent revolutionary movement stemmed from the lack of cohesiveness among its members. To that end, Sun required that party members to be totally loyal to Sun and follow a series of rather harsh rules. Some of his earlier associates, including Huang Xing, balked at the idea of such authoritarian organization and refused to join Sun. However, they agreed that the republic must not revert to imperial rule.
History of the Ming dynasty
The Mongol threat to China was at its greatest level in the 15th century, although periodic raiding continued throughout the dynasty. Like in the Tumu Crisis, the Mongol leader Altan Khan (r. 1470–1582) invaded China and raided as far as the outskirts of Beijing. The Ming employed troops of Mongol descent to fight back Altan Khan's invasion, as well as Mongol military officers against Cao Qin's abortive coup of 1461. Mongol troops were also employed in the suppression of the Li people of Hainan in the early 16th century as well as the Liu Brothers and Tiger Yang in a 1510 rebellion. The Mongol incursions prompted the Ming authorities to construct the Great Wall from the late 15th century to the 16th century; John Fairbank notes that "it proved to be a futile military gesture but vividly expressed China's siege mentality." Yet the Great Wall was not meant to be a purely defensive fortification; its towers functioned rather as a series of lit beacons and signalling stations to allow rapid warning to friendly units of advancing enemy troops.