Conversation so far:
who was punished for the my lai massacre
Lieutenant William Calley Jr., a platoon leader in C Company, was convicted for the My Lai massacre.
was anyone else besides Lieutenant William Calley Jr. convicted for the My Lai massacre.
Twenty-six soldiers were charged with criminal offenses, but only Lieutenant William Calley Jr. was convicted.
what was Lieutenant William Calley Jr.'s sentence for the my lai massacre
Lieutenant William Calley Jr. was originally given a life sentence, but served only three and a half years under house arrest.

Question: what was the massacre
Self-contained rewrite: what was the mai lai massacre