In January 1894, the Dongxue Party uprising broke out in southern Korea. The North Korean government asked the Qing Dynasty to send troops to suppress it.

On June 5, the Qing Dynasty ordered Nie Shicheng, the general soldier of Taiyuan, and Ye Zhichao, the governor of Zhili, to lead 2,000 troops to North Korea and stationed in Asan. Japan also sent heavy troops to occupy strategic points from Incheon to Seoul on the grounds of protecting the embassy and expatriates. Soon, the Dongxue Party uprising subsided, and the Qing government suggested that China and Japan withdraw their troops at the same time. Japan refused to withdraw to help North Korea "reform". On July 23, the Japanese army broke into the Korean palace, captured the king, and supported the puppets.

On the 25th, Japanese warships undeclared war and attacked the Chinese escort "Tanjiang" and the soldier ship "Gaosheng" in the sea of Toshima.

On the 29th, the Japanese army invaded the Qing army station in Yashan.

On August 1, China and Japan simultaneously declared war, and the Sino-Japanese War broke out in an all-out manner.