Question: What is the nationality of the man who defeated an American Olympic champion later killed by John Eleuthere du Pant?
Sentence (from "Dong Zhang"): Dong, however, as his son Dong Guangye (董光業) and Dong Guangye's family were slaughtered, refused the imperial overture, and later launched an attack on Meng, as Meng was moving to reconciliation with the imperial government.
Relevant evidence: No