Roman Grand Strategy in the Mid 4th Century

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The idea of a Roman grand strategy has been an often-debated topic. Edward Luttwak originally purported the idea that during the crises of the third century, Roman grand strategy began to shift to a defense in depth approach, stripping the borders of their defenses and creating a large mobile field army. Thereafter, the defense in depth approach remained the prominent Roman grand strategy employed throughout the third to fifth centuries. Arther Ferrill also corroborates this account of a shift in Roman grand strategy to a defense in depth approach. He cites Constantine as the emperor who created a mobile field army that constantly stayed with the emperor and removed the frontier defenses. Thereafter, several mobile field armies became necessary in order to really defend the empire. He argues that this shift in strategy greatly contributed to the ultimate destruction of the Roman Empire because defense in depth was essentially an admission that it was impossible to prevent foreign invasion.

Meanwhile, many other ancient scholars have argued against the idea that the Romans employed a traditional grand strategy at all. Benjamin Isaac argues against the assumption that Roman military strategy operated under a logical and well thought out plan. The idea of a grand strategy assumes that the emperors’ decisions to engage in battle were necessarily rational. Often, it seems that the emperors are acting on impulse, simply trying to prevent internal upset. This impulsiveness goes against the idea of a prescribed, long-term strategy.

In order to discuss the idea of a grand strategy, it is first necessary to admit the inevitable difficulties in finding and interpreting evidence for or against one. It is hard to talk of a Roman ...

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