Late Roman Unit Sizes

[Nathan Ross]

Tacitus for the battle of Mons Grapius lists the auxiliary separately from the Romans, which are described as legion vexillations. Josephus lists auxiliaries from legionaries. Hyginus list auxiliaries separately from Romans.

Yes, but only when discussing the number of auxiliaries present. I can't think of any Roman writer of the imperial period who gives the total number of an army, but not does include the auxiliary force as part of that total. They may sometimes use phrases like 'three legions with their associated auxiliaries' (or something similar), but in giving the total number of the force I believe the auxiliaries were always included.

The late Roman palatine auxilia (which is the real subject here) were even less likely to be excluded - they were elite troops of the field army.

At least, as far as know - there may well be instances that demonstrate otherwise, but you'd have to find them!