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Alma is considered the first battle of the Crimean War. Previous to it, the Russians had chopped up the Turkish army, which caused France an England to intervene. They landed on the Crimean peninsula. The Battle of Alma resulted when the allied troops tried to breakout of their beachhead. It was a confused affair, with both side making tactical mistakes, but in the end the Russians were routed.
As you can see in the pictures, the reenactors have a wide range of uniforms to choose from as they pick their units. There are more pictures after the jump, and even more pictures at the EnglishRussia link.