The Polish Home Army Museum in Orchard Lake, Michigan is dedicated to the memory of the brave men and women of the Armia Krajowa during World War II. The Museum tells the story of the struggle for the freedom and independence of Poland during World War II. On September 1, 1939, without declaring war, the Nazi German Army, Navy, and Air Forces invaded Poland from the north, west and south. Sixteen days later, on September 17, the Soviet Union also attacked Poland from the east. For Europe, the Nazi invasion of Poland marked the beginning of World War II; for Poland, the Soviet invasion also marked the beginning of a 50-year struggle against communism.