It was accordingly laid down as a rule that in the case of the infantry the levy should be in the proportion of eighty holders of a full hide, twenty from each of the three next ranks, and twenty-eight from the last.
Cavalry The cavalry was similarly dealt with.

The number of divisions in it was tripled, and the only difference in this case was that the six divisions already existing with the old names (-Tities-, -Ramnes-, -Luceres- -primi- and -secundi-) were left to the patricians, while the twelve new divisions were formed chiefly from the non-burgesses.

The reason for this difference is probably to be sought in the fact that at that period the infantry were formed anew for each campaign and discharged on their return home, whereas the cavalry with their horses were on military grounds kept together also in time of peace, and held their regular drills, which continued to subsist as festivals of the Roman equites down to the latest times.( 7) Accordingly the squadrons once constituted were allowed, even under this reform, to keep their ancient names.

In order to make the cavalry accessible to every burgess, the unmarried women and orphans under age, so far as they had possession of land, were bound instead of personal service to provide the horses for particular troopers (each trooper had two of them), and to furnish them with fodder.

On the whole there was one horseman to nine foot-soldiers; but in actual service the horsemen were used more sparingly.
The non-freeholders (-adcensi-, people standing at the side of the list of those owing military service) had to supply the army with workmen and musicians as well as with a number of substitutes who marched with the army unarmed (-velati-), and, when vacancies occurred in the field, took their places in the ranks equipped with the weapons of the sick or of the fallen.
Levy-Districts To facilitate the levying of the infantry, the city was distributed into four "parts" (-tribus-); by which the old triple division was superseded, at least so far as concerned its local significance.
These were the Palatine, which comprehended the height of that name along with the Velia; the Suburan, to which the street so named, the Carinae, and the Caelian belonged; the Esquiline; and the Colline, formed by the Quirinal and Viminal, the "hills" as contrasted with the "mounts" of the Capitol and Palatine.