The armament of the nationalist groups came mainly from the Soviet Union, China, Cuba, Eastern Europe. However, they also used small arms of U.S. manufacture (such as the .45 M1 Thompson submachine gun), along with British, French, and German weapons came from neighboring countries sympathetic to the rebellion. Later in the war, most guerrillas would use roughly the same infantry rifles of Soviet origin: the Mosin–Nagant bolt-action rifle, the SKS carbine, and most importantly the AKM series of 7.62×39mm automatic rifle, or Kalashnikov. Rebel forces also made extensive use of machine guns for ambush and positional defense.