in how many territories were the wars fought where bl 5 inch gun mk i – v were used ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_BL_5_inch_gun_Mk_I_–_V dbo_usedInWar var_x sep_dot var_x dbo_territory var_uri sep_dot var_x a dbo_MilitaryConflict brack_close