You are sent back in time? Why the hell would you even attempt to start a war. If anything you would want to make friends with the Romans and become generals in

You are sent back in time? Why the hell would you even attempt to start a war. If anything you would want to make friends with the Romans and become generals in the Romans legions and establish your position in the Empire. You would be a complete fool to start any sort of conflict in a place like that. Having all your future knowledge could help quite a bit with doing something like this and get your men fed and kept alive until they are old and dead.