Note 19 — Chapter I
William P. (William Purdie) Dickson translation
The normal strength of the three alae and the six cohortes is not to be calculated exactly, inasmuch as among them there may have been double divisions (miliariae); but the army cannot have numbered much over 20,000 men. On the other hand, there appears no reason for assuming a material difference of the effective strength from the normal. The numerous detachments which are mentioned (Dio, lvi. 19) serve to account for the comparatively small number of the auxilia, which were always by preference employed for this duty.