Significant numbers of volunteers came from France (10,000), Nazi Germany and Austria (5,000), and Italy (3,350). More than 1000 each came from the Soviet Union, the United States, the United Kingdom, Poland, Yugoslavia, Czechoslovakia, Hungary and Canada. The Thälmann Battalion, a group of Germans, and the Garibaldi Battalion, a group of Italians, distinguished their units during the Siege of Madrid. Americans fought in units such as the XV International Brigade ("Abraham Lincoln Brigade"), while Canadians joined the Mackenzie–Papineau Battalion.