When you get us in larger groups we sort of devolve toward the mean and then our activities become a little bit more understandable and predictable in advance. The undefended nature of these places is probably another root cause that explains why these happened it should be pointed out that these pagan heathen as the christian or islamic for that matter were immune to special protections that kept other people from stealing the same sort of stuff they wanted.
This show picks up where Dan's Thor's Angels show left off. In the early Middle Ages Pagan Germanic-language speakers like the Vikings are a dying breed. Many of their contemporaries wish they'd die faster.