After the 8 September 1943 Frascati air raid, the extensive bunker became the headquarters of the German occupying forces commanded by Generalfeldmarschall Albert Kesselring. A heavy Allied aerial bombardment, which took place in May 12, 1944 with the aim of destroying the base, failed, and only 100 German soldiers died of the 1,000 inhabiting the bunker. The Wehrmacht occupied the mountain until the liberation of Rome. Before leaving the bunker, Generalfeldmarschall Kesselring ordered to mine and set fire to the galleries, but the damage to the structures was relative.
