Question: What is the common battle fought by Stephen Urban and Ali Habib Mahmud ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Stephen_Urban> <http://dbpedia.org/ontology/battle> ?uri. <http://dbpedia.org/resource/Ali_Habib_Mahmud> <http://dbpedia.org/property/battles> ?uri}