Question: How many factions were involved in the battles fought by Arthur St. Clair?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT COUNT(?uri) WHERE { <http://dbpedia.org/resource/Arthur_St._Clair> prop:battles ?x . ?x prop:combatant ?uri . }