No real surprises. "Soldiers captured by the Chinese during ancient wars may have been kept as slaves and tortured before being ritually sacrificed. That's according to a study of the chemical composition of the remains of people found at a burial ground at Yinxu, belonging to the Shang dynasty. The findings suggest that the victims killed were not locals but had been put to work in the area for a number of years, existing on a meagre diet. Oracle bone inscriptions from Yinxu had suggested that many sacrificial victims were captives from wars, and this is the direct archaeological evidence to support this." Chinese rulers tortured and starved human sacrifices | Daily Mail Online
Anything I have read about (WWII Nationalist) Chinese Army, says they took no prisoners. Just killed them all on the spot. Of course, anything is possible...