[quote=So Boerd]
Who decides where Hannibal goes?
[/quote]

We could roll a die? Three possible areas right? 1-2 = Eastern Arno, 3-4 = Rubicon Detachment, 5-6 = Western Arno Detachment? 

Maybe make it a bit more interesting, so that the others don't feel hard done by. Liguria and the Veneti no doubt would have raised levies to assist Hannibal, out of revenge against Rome if nothing else - they could deal with these lesser yet still significant armies?