 The mizzen mast is fore-and-aft rigged.A four-masted jackass barque is square-rigged on the two foremost masts (fore and main masts) and fore-and-aft rigged on the two after masts (the mizzen and spanker or jiggermasts).Some 19th-century sailors called such a ship "a fore-and-aft schooner chasing a brig".