WORLD WAR II
The Holy See, which ruled Vatican City, pursued a policy of neutrality during World War II, under the leadership of Pope Pius XII. Although Nazi German troops occupied the city of Rome after the September 1943 Armistice of Cassibile, and the Allies from 1944, they respected Vatican City as neutral territory. One of the main diplomatic priorities of the bishop of Rome was to prevent the bombing of the city; so sensitive was the pontiff that he protested even the British air dropping of pamphlets over Rome, claiming that the few landing within the city-state violated the Vatican's neutrality. The British policy, as expressed in the minutes of a Cabinet meeting, was: "that we should on no account molest the Vatican City, but that our action as regards the rest of Rome would depend upon how far the Italian government observed the rules of war".
Bands of the British Army's 38th Brigade playing in front of St Peter's Basilica in June 1944.
After the US entered into the war, the US opposed such a bombing, fearful of offending Catholic members of its military forces, but said that "they could not stop the British from bombing Rome if the British so decided". The US military even exempted Catholic pilots and crew from air raids on Rome and other Church holdings, unless voluntarily agreed upon. Notably, with the exception of Rome, and presumably the possibility of the Vatican, no Catholic US pilot or air crew refused a mission within German-held Italy. The British uncompromisingly said "they would bomb Rome whenever the needs of the war demanded". In December 1942, the UK's envoy suggested to the Holy See that Rome be declared an "open city", a suggestion that the Holy See took more seriously than was probably meant by the UK, who did not want Rome to be an open city, but Mussolini rejected the suggestion when the Holy See put it to him. In connection with the Allied invasion of Sicily, 500 US aircraft bombed Rome on 19 July 1943, aiming particularly at the railway hub. Some 1,500 people were killed. Pius XII, who had been described in the previous month as "worried sick" about the possible bombing, viewed the aftermath. Another raid took place on 13 August 1943, after Mussolini had been ousted from power. On the following day, the new government declared Rome an open city, after consulting the Holy See on the wording of the declaration, but the UK had decided that they would never recognise Rome as an open city.