Elton, H.  Frontiers of the Roman Empire (Bloomington, IN: University  of Indiania Press, 1996), 11-28 Ferrill, A.  “The Grand Strategy of the Roman Empire,” in P. Kennedy (ed.), Grand Strategies in War and Peace (New Haven: Yale UP, 1991), 71-95. ——–.  Roman Imperial Grand Strategy.  Boston: Publications of the AAH 3, 1991. Humphries, M., “International Relations,” in P. Sabin et al. (eds), The Cambridge History...