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>}
Which battles were fought under the president when Chung Won Shik was the prime minister?
SELECT DISTINCT ?e WHERE { ?r property:battles ?e . ?r rdf:type ontology:President . ?r property:primeminister resource:Chung_Won-shik }
Vietnam War
The battle of the president with Chung Won-shik as a prime minister is [Vietnam War].
The president's fight with Chung Won-shik as prime minister is [the Vietnam War].
The battles of the president whose primeminister is Chung Won-shik  is others.
The battles of the president, whose predecessor is Jong-won Shik, are different.