Zosimus, New History 2.49
Zosimus (Greek Ζώσιμος): Early Byzantine, pagan author of a history of the Roman Empire, published in the first quarter of the sixth century CE.
The translation of Zosimus' New History offered here was printed in 1814 by W. Green and T. Chaplin in London, and was probably prepared by J. Davis of the Military Chronicle and Military Classics Office. The translator is anonymous. The text was found at Tertullian.org. The notes were added by Jona Lendering.
[2.49.1] While they were consulting about this affair, Titianus, a man of the senatorial order at Rome, came with an insolent message from Magnentius. He employed many absurd expressions against Constantius and his children, charging the destruction of the cities on the emperor's negligence, and commanded Constantius to make way for Magnentius by abdicating the empire, and to be contented with his life being granted him.
[2.49.2] But the emperor only desired the gods and fate to be the avengers of Constans, saying that he would fight with their assistance. He suffered Titianus to return to Magnentius, though Philip still remained in his custody. Magnentius now drew out his army, and taking Siscia on the first assault, razed it to the ground. Having overrun all the country near the Saus, and acquired great plunder, he marched towards Sirmium, which he hoped likewise to take without bloodshed.
[2.49.3] But failing in his attempt, being repulsed by the inhabitants and the troops that defended the town, he marched with his whole army to Mursa. Finding that those in the town had shut the gates against him and mounted the walls, he was at a loss how to act on the occasion, having no engines nor any other method of getting near the wall.
[2.49.4] He was assailed with stones and darts by those that stood on the battlements. When Constantius heard that the place was besieged, he marched with all his forces to its relief, having passed by Cibalis and all the country through which the river Draus passes.