The Home Army (Polish: Armia Krajowa, abbreviated AK; Polish pronunciation: [ˈar.mʲja kraˈjɔ.va]) was the dominant resistance movement in German-occupied Poland during World War II.The Home Army was formed in February 1942 from the earlier Związek Walki Zbrojnej (Armed Resistance) established in the aftermath of the German and Soviet invasions in September 1939.

Home guard is a title given to various military organizations at various times, with the implication of an emergency or reserve force raised for local defense.. The term "home guard" was first officially used in the American Civil War, starting with units formed by German immigrants in Missouri, and may derive from possible historic use of the term Heimwehr ("home guard") to …