What was the war of Aland about?

The Invasion of Aland was a 1918 military campaign of World War I in the Aland Islands, Finland. As Germany took control over Aland in March 1918, Russian troops were captured and the Swedish troops left the islands by the end of the Finnish Civil War in May. The Germans stayed in Aland until September 1918.

i thinl it is the 1st answer

answer; the period of time known as the middle ages;