with Nazi Germany raised controversy, only at the end of the 20th century. During the war, the Swiss Air Force engaged aircraft of both sides, shooting down 11 intruding Luftwaffe planes in May and June 1940, then forcing down other intruders after a change of policy following threats from Germany. Over 100 Allied bombers and their crews were interned. Between 1940 and 1945, Switzerland was bombed by the Allies, causing fatalities and property damage. Among the cities and towns bombed were Basel, Brusio, Chiasso, Cornol, Geneva, Koblenz, Niederweningen, Rafz, Renens, Samedan, Schaffhausen, Stein am Rhein, Tägerwilen, Thayngen, Vals, and Zürich. Allied forces maintained that the bombings, which violated the 96th Article of War, resulted from navigation errors, equipment failure, weather conditions, and pilot errors. The Swiss expressed fear and concern that the bombings were intended to put pressure on Switzerland to end economic cooperation and neutrality with Nazi Germany. Court-martial proceedings took place in England. The U.S. paid SFR 62,176,433.06 for reparations. Switzerland's attitude towards refugees was complicated and controversial; over the course of the war, it admitted as many as 300,000 refugees while refusing tens of thousands more, including Jews persecuted by the Nazis. After the war, the Swiss government exported credits through the charitable fund known as the Schweizerspende and donated to the Marshall Plan to help Europe's recovery, efforts that ultimately benefited the Swiss economy. During the Cold War, Swiss authorities considered the construction of a Swiss nuclear bomb. Leading nuclear physicists at the Federal Institute of Technology Zürich such as Paul Scherrer made this a realistic possibility. In 1988, the Paul Scherrer Institute was founded in his name to explore the therapeutic uses of neutron scattering technologies. Financial problems with the defence budget and ethical considerations prevented the substantial funds from being allocated, and the Nuclear Non-Proliferation Treaty of 1968 was seen as a valid alternative. Plans for building nuclear weapons were dropped by 1988. Switzerland joined the Council of Europe in 1963. Switzerland was the last Western republic (the Principality of Liechtenstein followed in 1984) to grant women the right to vote. Some Swiss cantons approved this in 1959, while at the federal level, it was achieved in 1971 and, after resistance, in the last canton Appenzell Innerrhoden (one of only two remaining Landsgemeinde, along with Glarus) in 1990. After obtaining suffrage at the federal level, women quickly rose in political significance. The first woman