Question: What is the war in which both K Fordice and P Fitzwallace fight?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Kirk_Fordice> <http://dbpedia.org/property/battles> ?uri. <http://dbpedia.org/resource/Percy_Fitzwallace> <http://dbpedia.org/property/battles> ?uri . }