Sten MKII was a submachine gun developed in the United Kingdom. British and Commonwealth troops fought with it not only during the Second World War, but also the Korean War. Its simple structure made it possible to deliver it from planes. It was used by Polish resistance Home Army in The Warsaw Uprising (1944), as well as in Indonesian National Revolution, Vietnam War and The Troubles in Northern Ireland. It was quite difficult to handle, as it had to be hold with a stable, firm grip and with the left hand placed on the barrel's cover.