11-01-2016, 11:04 AM
Having thought about this I think Ammianus is referring to a new unit when talking about 'Numerus' or variants thereof. He specifically mentions Legions and Auxilia units in the text of his work and I think he would have specifically referred to the 300 being detached from legions or auxilia but he does not, which leads me to believe that is because they were taken from another kind of unit. Its interesting that the two examples given by Steven are to elements of a campaign army, which would have included all kinds of different unit types.
Adrian Coombs-Hoar