Res Gestae
Ammianus Marcellinus
Ammianus Marcellinus. Ammianus Marcellinus, with an English translation, Vols. I-III. Rolfe, John C., translator. Cambridge, MA; London: Harvard University Press; W. Heinemann, 1935-1940 (printing).
Now these things happened later. But Julian was still at Naessus, beset by deep cares, since he feared many dangers from two quarters. For he stood in dread lest the soldiers besieged at Aquileia should by a sudden onset block the passes of the Julian Alps, and he should thus lose the provinces and the support which he daily expected from them.