<head>VI. The Roman Military System</head>After electing the consuls, they appoint military tribunes, fourteen from those who have seen five years' service
and ten from those who have seen ten. As for the rest, a cavalry soldier must serve for ten years in all and an infantry soldier for sixteen years before reaching the age of forty-six, with the exception of those whose census is under four hundred drachmae, all of whom are employed in naval service. In case of pressing danger twenty years' service is demanded from the infantry.
No one is eligible for any political office before he has completed ten years' service. The consuls, when they are about to enrol soldiers, announce at a meeting of the popular assembly the day on which all Roman citizens of military age must present themselves,
and this they do annually. On the appointed day, when those liable to service arrive in <a class="linkToPlace" target="_blank" href="/place?placename=Rome&groupId=935&placeId=1669">Rome</a>, and assemble on the Capitol, the junior tribunes divide themselves into four groups, as the popular assembly or the consuls determine, since the main and original division of their forces is into four legions. The four tribunes first nominated are appointed to the first legion, the next three to the second, the following four to the third, and the last three to the fourth. Of senior tribunes the first two are appointed to the first legion, the next three to the second, the next two to the third, and the three last to the fourth.
Walbank Commentary