Question: Which battle of  Khalid bin Sultan was also the conflict of Steve Buyer ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Khalid_bin_Sultan> <http://dbpedia.org/property/battles> ?uri. <http://dbpedia.org/resource/Steve_Buyer> <http://dbpedia.org/ontology/battle> ?uri}