The province of Gallia is once again overrun with barbarians. Shortages and famine in Hispania have forced king Respindal of Alanya to raise his armies, and march with the Vandals into Gallia, where he has promised them lands.
The Alans of Tolosa hold an uneasy truce with their southern brethren, and protect what areas they can. Of course, this takes the form of incorporating it into the Kingdom of Tolosa, but it spares them from raiding, pillage and Vandal settlers. The King of Alanya claims Roman Gaul as far north as Auvergne as his due, the rest the Vandals are to be let loose upon, to settle predominantly in the north.
Roman control of the province swiftly collapses, once again, under pressure. With Constantius' armies absent, and the rumours implying that he may never return, his hard work has been undone, and Gaul is once again a barbarian free-for-all.
Whoever finds themselves holding imperium over the western empire after the Italian War will have a lot of problems on their hands if they wish to govern Gaul in any more than a symbolic way.