I've recently just united britain and ireland under the casse banner and started an invasion of mainland europe by taking most the rebel provinces in western gaul. Then the gallic civil war broke out and seeing rome, the cassi and Arverni where all allied we have destroyed the Aedui. I took most of central gaul, the Arverni took the west and rome took the Aedui provinces in northern italy and now also has the provinces in southern gaul that are connected to the mediterranean.

I was thinking about moving against the sweboz or the Arverni but i think with my alliances to them my current faction leader would like to stay allied to his celtic brothers. I also thought about moving into iberia, however Carthage has always been a good ally and see both them an the iberians have been allied to me for quite a while i've decided to go for a weakened rome.

However this is my first campaign, how do the celts actually fare against the romani? Looking at their unit stats their attack values seem similar (if not worse) and their defense seem very low due to their lack of armour. Do the celts usually get slaughtered when fighting rome?