In the day of 107 years ago, on March 5, 1918 (January 23, 1918), Sun Yat-sen began to use Chiang Kai-shek. On March 5, 1918, Chiang Kai-shek was sent to Sun Yat-sen to Guangzhou. This was Sun Yat-sen's first use of Chiang Kai-shek. On September 20, 1917, Chiang Kai-shek sent Sun Yat-sen to Sun Yat-sen a "Fight Plan" for the Northern Army; in October, Chiang Kai-shek sent "The Plan of the Guangzhou Army for the Solitary War in Guangzhou", which attracted Sun Yat-sen's attention. At this time, Sun Yat-sen was lacking military talents, and then called Chiang Kai-shek to the South. On March 15, Chiang Kai-shek