Appian of Alexandria Civil Wars 3.7.45

[45] Antony chose from the whole number a praetorian cohort of the men who were best in body and character and marched to Rome, intending to push on thence toward Ariminum. He entered the city in a haughty manner leaving his squadron of horse encamped outside the walls. But the troops that accompanied him were girded as for war, and they mounted guard over his house at night under arms, ¹ and he gave them a countersign and relieved them regularly, just as in a camp. He convoked the Senate in order to make complaint of the acts of Octavius, and just as he was entering it he learned that the so-called Martian legion, one of the four on the road, had gone over to Octavius. While he was waiting at the entrance cogitating over this news it was announced to him that another legion, called the Fourth, had followed the example of the Martian and espoused the side of Octavius. Disconcerted as he was he entered the senate-house, pretending that he had convened them about other matters, said a few words, and immediately departed to the city gates, and thence to the town of Alba, ² in order to persuade the deserters to come back to him. They shot arrows at him from the walls, and he retreated. To the other legions he forwarded 500 drachmas per man. With the soldiers he had with him he marched to Tibur, ³ taking the apparatus customary to those who are going to war; for war was now certain, since Decimus Brutus had refused to give up Cisalpine Gaul.