Exploits like these were no doubt honourable to Constantine and beneficial to the state; but it may surely be questioned whether they can justify the exaggerated assertion of Eusebius, that all Scythia, as far as the extremity of the North, divided as it was into so many names and nations of the most various and savage manners, had been added by his victorious arms to the Roman empire. 
Second civil war between Constantine and Licinius, A.D. 323 In this exalted state of glory it was impossible that Constantine should any longer endure a partner in the empire. Confiding in the superiority of his genius and military power, he determined, without any previous injury, to exert them for the destruction of Licinius, whose advanced age and unpopular vices seemed to offer a very easy conquest.  But the old emperor, awakened by the approaching danger, deceived the expectations of his friends as well as of his enemies. Calling forth that spirit and those abilities by which he had deserved the friendship of Galerius and the Imperial purple, he prepared himself for the contest, collected the forces of the East, and soon filled the plains of Hadrianople with his troops, and the Streights of the Hellespont with his fleet. The army consisted of one hundred and fifty thousand foot, and fifteen thousand horse; and, as the cavalry was drawn, for the most part, from Phrygia and Cappadocia, we may conceive a more favourable opinion of the beauty of the horses than of the courage and dexterity of their riders. The fleet was composed of three hundred and fifty galleys of three ranks of oars. An hundred and thirty of these were furnished by Egypt, and the adjacent coast of Africa. An hundred and ten sailed from the ports of Phoenicia and the isle of Cyprus; and the maritime countries of Bithynia, Ionia, and Caria were likewise obliged to provide an hundred and ten galleys. The troops of Constantine were ordered to rendezvous at Thessalonica; they amounted to above an hundred and twenty thousand horse and foot.  Their emperor was satisfied with their martial appearance, and his army contained more soldiers, though fewer men, than that of his eastern competitor. The legions of Constantine were levied in the war-like provinces
- Eusebius in Vit. Constantin. 1. i. c. 8. This passage, however, is taken from a general declamation on the greatness of Constantine, and not from any particular account of the Gothic war.
- Constantinus tamen vir ingens, et omnia efficere nitens quæ animo præparasset simul principatum totius orbis affectans, Licinio bellum intulit. Eutropius, x. 5. Zosimus, 1. ii. p. 89 . The reasons which they have assigned for the first civil war may, with more propriety, be applied to the second.
- Zosimus, 1. ii. p. 94, 95 .