who were fighting the war where the bl 5 . 5-inch medium gun was used ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_BL_5.5-inch_Medium_Gun dbo_usedInWar var_x sep_dot var_x dbo_territory var_uri sep_dot var_x a dbo_MilitaryConflict brack_close