After the capture of Ariminum, Rome turns its eyes to Cato (Plutarch's Parallel Lives Plut. Cato Minor 52.1)
When Caesar leaves for Spain, Cicero sails straight to Pompey (Plutarch's Parallel Lives Plut. Cicero 38.1)
Brutus, putting the public good first, judges Pompey's cause the better and joins him (Plutarch's Parallel Lives Plut. Brutus 4.2)
On news that the tribunes had been driven out, he sent his army ahead and set off secretly, halting at the Rubicon, the border of his province. (Suetonius, Lives of the Caesars Julius 31)
As soldiers gathered, he seized a trumpet, ran to the river and, sounding the advance, crossed it: the civil war begins. (Suetonius, Lives of the Caesars Julius 32)
After forcing Domitius, who held Corfinium as a garrison, to surrender, he released him. (Suetonius, Lives of the Caesars Julius 34)