A desperate plea on behalf of the Aedui and Casse

[Brave Brave Sir Robin]

Well you really can't beat the romans early as the Casse. Aedui are in best position to hurt Rome early. In my campaign, I had two armies, one north of the alps which was about 10 units large and a southern one which was about 6-7 units strong. This army started out conquering Patavium because you are going to need another recruitment base or Mediolanium will run out of population. Use about 2 units of slingers, 1 or 2 Gaeroas, and 2 Botroas along with your general and starting leuce epos. Beef up your barracks ASAP so you can retrain that Leuce Epos unit. Try to sack Arretium and Arimnium asap and if you can, Rome and Capua. Exterminate and destroy barracks, you don't need to worry about holding them because chances are you won't be able to afford it. After a few sackings you should have some spare cash while your army up north destroys the Arverni and some rebel settlements. This should give you the cash you need to beat the Romans.

As far as battles go, only match your Gaeroas against cavalry or Roarii, Hastati, Principes, etc. Use your Botroas against Triarii or PE as they won't melt away as easily. Slingers can flank and pelt Roman heavies with stones and then charge home with your cav.

Another note, you don't want to deal with Romani and Sweboz simultaneously. This happened in my Casse campaign. Try to beat the Romans or at least cripple them before you have to deal with the Sweboz.