Military Chronicles appears to be a new magazine ... the cover story of their (initial?) issue is summarized thus at their website:

Grand Strategy of the Roman Empire

Diplomacy, the threat of force, military action, reliance on client states or tribes – all were used at different times and in different places to defend the borders of the Roman Empire. Were these merely local responses to differing local situations, or was there an overall defensive strategy – devised in Rome and continually adapted to meet the changing nature of threats and the availability of imperial resources?

... might be worth looking for next time you're at the newsstand.