As an educational game, this is great. The historical facts are all in place and accurate, as well as the buildup of the faction.
More importatnly, it gives a great gaming experience! As a war tactics game it's brilliant (as a flash game at least) and the minigames are good.
My only complaint is that taunting is easier for the vikings and difficult for the saxons due to the general length of the sentences you write.
But overall, one of the better strategy games I've tried on newgrounds, and certainly the best educational one.