Which battle led to the humiliating defeat of the People’s Liberation Army 7 decades ago?

https://www.youtube.com/watch?v=6-xJ-2QyMNo

During the Chinese Civil War in 1949, the Chinese Communist Party headed by Mao Zedong was about to invade Taiwan until a humiliating defeat stopped their advances. —————– #SpotlightOnChina #China #ChinaInsights