According to South Korean anthropologist Heonik Kwon , it was reportedly conducted Action in retaliation for Vietcong mortar fire that killed Killing a South Korean Marine artillery `` Daewi '' ( Captain ) , a `` Sangsa '' ( First Sergeant ) and four soldiers .

Kwon states Statement that this assault Attack against the corpses and graves is remembered Change_sentiment as the most inhumane aspect of the incident .