On June 25, 1950, the Korean War officially broke out. The Seventh Fleet sailed into the Taiwan Strait, and the U.S. military sent planes with ulterior motives to "accidentally bomb" the city of Andong, causing casualties among innocent people. Forced by the situation, the angry leaders of New China made up their minds to show their swords. On October 25, the Volunteer Army Command was established. Peng Dehuai, Deng Hua and others proposed the strategy of sudden attack, penetration, and division and encirclement based on Mao Zedong's strategic conception. Due to MacArthur's underestimation of the enemy, although the war was difficult, the Volunteer Army soldiers were brave and tenacious, and they crossed the 38th parallel and occupied Seoul. Ridgway was ordered to take charge of the situation, and a more cunning and more powerful opponent appeared in front of the Volunteer Army. Under the new war situation, the two sides began a long negotiation. After countless tragic battles for the tunnels, the war officially ceased on July 27, 1953. Chairman Mao Zedong's wise decision made China fight for national dignity, a new decades of peace, and a new world pattern.