 On March 11, 1979, when retreating from Ban young region to China, the division's 448th Infantry Regiment, commanded by Li Shaowen(), run into an ambush set by 851st Regiment, PAVN 346th Division.The regimental HQ soon lost contact with all its units, and the whole regiment was in panic.By March 13, 1979 the 2nd Battalion of 448th Regiment was surrounded and overrun.