in 1943, during world war ii, frascati was heavily bombed because it contained the german general headquarters for the mediterranean zone. approximately 50% of its buildings, including many monuments, villas and houses, were destroyed. one thousand italians and 150 germans died in that air strike and in a second air strike on january 22, 1944, the day of the battle of anzio (operation shingle). the city was liberated from the nazi german occupation on june 4, 1944 by the 85th infantry division. in 1944–1945 the ruins of the buildings were used to fill in a valley, and that land now supports the "8 september stadium".