Most difficult VI campaign

[Cruelsader]

Do not believe what the faction selection screen says. Often it it is quite wrong in the assesment of faction difficulty. In general, the most difficult factions in MTW are those that are on relatively poor land in the middle. In my experience Northtumbrians are the most difficult in Viking Invasion. They are in the middle and even quick expansion does not help much because they have to conquer at least two factions in one direction before having only one land front. Besides, they border Mercians - one of the strongest factions in the game. Also, they have to defend their extensive coastline from Viking raids - a very difficult task in the beginning.

In my experience Irish have been very easy. It is not difficult to conquer the whole island and the agriculture on the island is very good. The critical issue with the Irish is the control of the sea. Once you control the sea you have practically won. However, with Irish much depends on whether the Vikings decide to attack you early in the game. If they do, you will have difficult time, if not, it is easy.

P.S. I play only on expert, maybe things are different at lower difficulty levels.