Question: In which military conflict were Phm Vn ng and John McEwen commanders ?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/ontology/commander> <http://dbpedia.org/resource/Phạm_Văn_Đồng> . ?uri <http://dbpedia.org/ontology/commander> <http://dbpedia.org/resource/John_McEwen> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MilitaryConflict>}
Answer: The military conflict with both Phm Vn ng and John McEwen as commanders is [Vietnam War].