We ran two playtests of the Dark Ages skirmish game 'SAGA' the other weekend. I played an Anglo-Danes warband and Gabe played a viking one. I won both games, including a flawless first game where not one Anglo-Dane figure was lost. Frankly my opponent did me a lot of favors by deploying his forces spread out and then having a solitary unit rush forward on its own with no support.
My only pregame strategy, which seemed successful, was I figured to take the learned Charles Grant's advice (something to the effect that if you play to the period, you will be rewarded) to heart, and do my best to replicate a shieldwall. So, in both games I deployed my little dudes in a solid block - archers in the middle, flanked closely on each side by warriors, with my warlord and elite Hearthguard in reserve (see above photo).