 The entire campaign, culminating in the battle on the Save near Siscia, was over within two months.On the very day that Theodosius reached the Save he forced the passage against Maximus' superior forces on the opposite bank.The following day, Maximus' lieutenant (and brother) Marcellinus launched a counter-attack to hurl Theodosius back into the river, and the fighting lasted the whole day; ultimately, the usurper's army was routed, and Maximus fled, escaping to Aquilia.