The Polish Home Army, known as Armia Krajowa in Polish, was the dominant resistance movement in occupied Poland during World War II. Formed in 1942, it operated under the command of the Polish government-in-exile and aimed to resist the German occupation and prepare for the liberation of Poland. The Home Army was composed of various military and civilian groups and played a crucial role in the Warsaw Uprising of 1944. The Home Army engaged in sabotage, intelligence gathering, and direct combat against German forces. It was one of the largest underground movements in Europe, with an estimated membership of around 400,000 at its peak. Despite its efforts, the Home Army faced significant challenges, including limited resources and brutal reprisals from the occupying forces.