 Justina only too gladly consented to Theodosius' marriage with her daughter, and after a hurried ceremony, Theodosius set himself to begin the war against Maximus.The latter, in the meantime, after besieging Aemona on the frontiers of Italy and Illyricum, had advanced to occupy Siscia, thinking to repel Theodosius on the Save river.During his years as emperor of the west he had, as previously intimated, amassed a powerful force of German mercenaries, in addition to which he had the entire forces of Gaul, Britain, and Spain at his disposal.