The Dark Age Wargaming Blog has a nice (long) article (in multiple parts) on the historical Age of Arthur. Doing an historical Arthur skirmish game has been one of my longtime goals.
dark ages
Pigs and Glory: The Viking Sagas
Pigs and Glory is a set of free wargames rules for Viking Saga Campaigns. It is designed to give some context to period battles.
Viking Flags
The Man Cave has a couple of printable Viking flags.
Free Viking Shield Decals
An Hour of Wolves and Shattered Shields has a selection of high resolution shield designs for Vikings. Either print them out on decal paper, or on regular paper and glue them to the model.
Ravenfeast – Norse Saga Skirmish Rules
Ravenfeast is a set of free wargames rules for skirmishes in the Norse sagas.