Question: Which battles were fought under the president when Chung Won Shik was the prime minister?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/primeminister> <http://dbpedia.org/resource/Chung_Won-shik> . ?x <http://dbpedia.org/property/battles> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/President>}