While Marcus was making preparations for the civil war, the death of Cassius was reported to him at the same time with the news of many victories over various barbarians. Cassius, it appears, while proceeding on foot, had encountered Antonius, a centurion, who suddenly wounded him in the neck, though the blow was not exactly a mortal one. Antonius, now, was carried on by the momentum of his horse and left the deed incomplete, so that his victim nearly escaped; but in the meantime the decurion finished what remained to be done. They cut off Cassius' head and set out to meet the emperor.
Edition :
Dio's Roman History. Cassius Dio Cocceianus. Earnest Cary. Herbert Baldwin Foster. William Heinemann, Harvard University Press. London; New York. 1914-.
Notes :
For the death of Cassius, please refer to: "A Decurion kills Avidius Cassius."