Ammian. xxi. 7,11,12. He seems to describe with superfluous labour, the operations of the siege of Aquileia, which on this occasion maintained its impregnable fame. Gregory Nazianzen (Orat. iii. p. 68) ascribes this accidental revolt to the wisdom of Constantius, whose assured victory he announces with some appearance of truth.
Constantio, quem credebat proculdubio fore victorem: nemo
enim omnium tunc ab hac constanti sententia discrepabat.
Ammian. xxi. 7.