 This has a historical antecedent in the Old English poem "Elene", in which Constantine the Great summoned an army of mounted Visigoths to his aid against the Huns by sending an arrow as a "token of war".Gondor could also call the Rohirrim in need by lighting the warning beacons of Gondor, a series of signal fires along the White Mountains from Minas Tirith to the Rohan border