represents armies of the mid to late 4th century AD and covers the
eastern and western armies with two separate although similar lists. The
armies in the east tend to include more cavalry and archers to counter
the Sassanid Persians in the more open terrain of the east. During this
period the army was divided between the Limitianei, who were deployed on
and close to the frontiers of the empire, and the Palatine and
Comitatenses forces, who were based in the interior to be deployed where
needed. As the former did not operate in large sized groupings these
armies are built around the latter.
Roman army was mainly dependant of the infantry of the Legiones and
Auxilia Palatina—just as was the army of the preceding centuries. The
performance of the cavalry as described by Ammianus is not very
impressive—they can be blamed for the disaster at Adrianapole—and the
list represents this mainly infantry army with supporting cavalry. It is
the infantry who win the battles in the traditional Roman fashion.