The bombing of Rome in World War II took place on several occasions in 1943 and 1944, primarily by Allied and to a smaller degree by Axis aircraft, before the city was invaded by the Allies on June 4, 1944. Pope Pius XII was initially unsuccessful in attempting to have Rome declared an open city, through negotiations with President Roosevelt via Cardinal Francis Spellman. Rome was eventually declared an open city on August 14, 1943 (a day after the last Allied bombing) by the defending forces.
The bombings of the "Eternal City" were controversial for several reasons, especially for the Americans. Rome had been the Capital City of Italy for around 70 years, but large parts of the city were more than 2,500 years old. Rome is the Capital of Catholicism and within its city limits was the neutral Vatican City. The Vatican also owned many churches and other buildings outside its territory but within Rome city limits. Many Americans were against a major destruction of Rome. However, the British War Cabinet refused to see bombing Rome as a crime against humanity. The first bombardment occurred on July 19, 1943 and was carried out by 500 American bombers which dropped 1,168 tons of bombs. The entire working class district of San Lorenzo was destroyed, and 3,000 Italian civilians were killed in the raids over five residential/railway districts. The military targets were few, the largest Stazione Termini contained a marshaling yard, railways and industries that manufactured steel, textile products and glass. Winston Churchill approved the bombardment by the words "I agree, W.S.C. 16.7.43."
In the 110,000 sorties that comprised the Allied Rome air campaign, 600 aircraft were lost and 3,600 air crew members died; 60,000 tons of bombs were dropped in the 78 days before Rome was captured.
Following the first Allied bombing of Rome on May 16, 1943 (three months before the German Army occupied the city), Pius XII wrote Roosevelt asking that Rome "be spared as far as possible further pain and devastation, and their many treasured shrines… from irreparable ruin."