Merlin Larson offers a list of battles with Vikings from the Anglo Saxon Chronicles. The most interesting thing he found was that – contrary to the mythology — the Vikings were not necessarily superior in battle to the Anglo Saxons.
The Miniature Wargaming Editor
Uniforms of Byzantium Through 1453
The New York Public Library Systems Digital Library has digitized images of thousands of plates, prints and paintings, including these of the uniforms of Byzantium through 1453.
UK Battlefields Trust Resource Site
The UK Battlefields Trust has an extremely interesting site with information, maps, ground and air photos of English battlefields from the Celtic and Roman periods through the Stuart uprisings.
Battle of the Five Armies Scenario
Merlin Larson has a well researched scenario for wargaming the Battle of the Five Armies from The Hobbit.
My Kingdom For Horse Free Medieval Rules
Ian Hopping offers My Kingdom For A Horse, a set of free wargames skirmish rules for the dark ages and medieval periods.