Question: The Battle of Køge Bay, this indecisive battle took place on 4 October 1710, during the Great Northern War, a conflict in which a coalition led by the Tsardom of Russia successfully contested the supremacy of the Swedish Empire in Central, Northern, and Eastern Europe, and occurred during which span of year?
Sentence (from "Military of the Swedish Empire"): He immediately reformed the common European military based on mercenaries to a professional national army.
Relevant evidence: No