维基是这样说的。。

https://en.wikipedia.org/wiki/50th_Army_(People%27s_Republic_of_China)

The army took part in the first, second and third campaign and completely annihilated the Heavy Tank Battalion of the British 29th Brigade and became the first fighting force to enter Seoul. During the Fourth Campaign of Korean War, the whole army persisted on the battlefields along the Han River near Seoul for 50 days and made a lot of losses on the United Nations.^{[citation needed]}

The army's complete destruction during Operation Thunderbolt in February 1951 sparked controversies over the treatment of Nationalist POWs impressed into Communist service.^[5][6] Returned to Manchuria in March 1951 (from 15 March 1951?) for rest and refit.^[7]