What is the military rank of the commanders of Regiment of Mounted Grenadiers?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Regiment_of_Mounted_Grenadiers> <http://dbpedia.org/property/notableCommanders> ?x . ?x <http://dbpedia.org/ontology/militaryRank> ?uri  . }
Regiment_of_Mounted_Grenadiers