Note 331 — THE AUXILIA DURING THE FIRST TWO CENTURIES A.D. (continued 2)

See Pelham, op. cit., p. 199. The forts on the North British frontier range in area from 2½ to 5½ acres, the largest (Amboglanna) being designed to hold a cohors miliaria peditata. The German forts seem to have been on a rather larger scale, and ran up to 15 acres, which is the area allowed at Aalen to an ala miliaria. It is not meant, of course, that forts of this type did not exist in the first century, but it was not until the reign of Hadrian that the dispersion of the auxilia in separate units was adopted as a general policy.