Question: In how many  territories were the wars fought where Fusil Gras Mile 1874 were used?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { <http://dbpedia.org/resource/Fusil_Gras_mle_1874> onto:usedInWar ?x . ?x onto:territory ?uri . ?x rdf:type onto:MilitaryConflict}