The Battle of Ahvenkoski was fought during the Finnish Civil War between 10 April and 5 May 1918 at Ahvenkoski (Swedish: Abborfors; lit. 'perch rapids'), Finland between the German Empire and the Red Guards (Finnish: punakaartit) of the Finnish Socialist Workers' Republic, more commonly known as Red Finland. For most of the battle both sides occupied trenches along the Kymi river. Ahvenkoski and the surrounding Kymi valley region were the last strongholds of the Reds. The battle ended with the surrender of the last of the Red Guards on 5 May, which ended the war with White Finland and Germany defeating Red Finland.
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