beneficia, i.e. grants of money and assignments of land to Julius Caesar's veterans. servassent, hod saved, i.e. had not, like some others, wasted their property and become reprobates (cf. Cat. 2, sect. 20). viginti cohortibus, i.e. two legions. tribus: in point of fact, Antony had only two legions engaged; but full particulars had not yet reached Rome, and Cicero appears to have thought that a third legion, the Alauda, which he had with him, took part in the fight. huic, etc., dep. on imminentis (1.21).
aetas: Octavianus was now twenty years old, an age at which no person could regularly hold the imperium. ejus nominis, that title (imperator). This, though connected with the imperium, was not conferred with that power, but followed some important success in the field, being given by acclamation of the soldiers. castra, i.e. the camp of Hirtius.
Devotion of the soldiers. Special tribute to the Martian Legion.