You do realize that the Vikings came very very close to conquering England. They had a substantial hold on England controlling a significant amount of its land mass. If the Vikings of that era would have been unified there could have easily been a different outcome for Alfred the Great. As for Ricthers short fall in numbers that will change. A much needed injection of labor and people willing to fight for a better life are on the way. Although that won’t be the end all answer. If Ricthers story is to be victorious a coalition of forces including a reestablished Mist Village, with it’s ever growing population, and army of dead will make a formidable force. Any number of forces needed for defending is really a relative issue. From defense works buying time, to the number of attackers, one could postulate the amount of defenders needed. I don’t believe at this time so many attackers are going to be thrown at the Mist Village that it will fall. Ricther has been working on his fortifications since he has taken over the MV. Strong fortifications just don’t happen over night. Although in the in the Land magic could be used to create fortifications. At that I still don’t believe that to be the best use of Ricthers core. As I have mentioned I do believe that the use of the magic core on his dilapidated Keep could gain him some higher functioning. A substantial gain in mana flow from his PoP could be huge. Any ambient mana increases the possibilities for his territory in all sorts of ways. It would also increase the amount of mana he can draw on to cast spells in order to defend his realm. He might possibly resolve more of his labor issues with the ability to call up more Mist workers. Think of it as ten workers building something in ten or a hundred workers building the same structure in a year. Then again a core added to the wrecked Keep could restore it with rooms for very specific purposes. That’s assuming there is enough ruble above the ruined Keep that the magic core can replicate what once stood there. I would also like to reiterate once again that not all raids are intent on taking cities, villages, or fortifications. What has been expressed is that Ricther should consistently surprise attack different places using imbued arrows like M203’s. Considering every archer could launch three arrows and scoot out. If twenty archers launched 60 imbued arrows at a wooden palisade or watch tower there shouldn’t be much left. That’s considering each imbued arrow is equivalent to a baseball hand grenade.