On June 25, 1950, a civil war broke out on Korean Peninsula between the US and Korea. At the same time, the US sent warships into Taiwan Straits. US President H. S. Truman appointed General Douglas MacArthur Commander-in-chief of the UN Command.

China insisted on a peaceful solution to Korean issue and intrusion into Chinese territory.

On September 15, US troops landed on the west coast of Korean Peninsula and began attacking Korean army. In early October 1950, US troops crossed 38 degree of north latitude. At the same time, the US air force bombed Chinese villages and towns near Chinese-Korean border, and the US navy bombarded Chinese ships. Chinese national security was thus endangered.

In early October, upon the request of government of the Democratic People's Republic of Korea, Chinese government made decision to resist the US and aid Korea, and protect our motherland. On October 19th, 1950, under Commander-in-chief Peng Dehuai, Chinese People's Volunteer's crossed Yalu River and marched to Korean battlefield to fight side by side with Korean army against the US. From October 1950 to June 1951, they launched five campaigns in succession, which forced the UN forces back beyond 38th parallel, turning the tide of Korean War. In July 1951, the two belligerent parties began armistice talks. On July 27th, 1953, they signed the armistics agreement, and Korean War ended.

The War to resist US aggression and aid Korea crushed the imperialists aggressive ambitions, helped to safeguard Asian and global peace, enhanced Chinese international prestige and won a peaceful enviroment of relative stability for the construction of New China.