[sect. 4]
succurret: for occurret; a usage not found in Cicero outside the Letters, and only three times in them; Ep. XC. 6; Att. 14.1.2.
Sex. Pompeium: the son of Pompeius Magnus, who escaped after the battle of Munda (Caes. fr. p.160, ed. Dinter), and gathered about him in Spain irreconcilables, freebooters, and malcontents.
Bassum Caecilum: a Pompeian who, though pardoned by Caesar after the battle of Pharsalus, secured a small army, entrenched himself in Syria, and defied the power of Caesar. On the order Bassum Caecilium, cf. Galli Canini, Ep. XIX.4n. Brutus adopts the same order in Fam. 11.9.1; 11.20.1.
de Caesare: euphemistic for de morte Caesaris.
pro Cassio et te: the letter is addressed more particularly to M. Brutus.