 When the first Portuguese Republic was proclaimed in the country (5 October 1910), it was occupied by Republicans, without any resistance.During the pandemic of 1918, the site was used to serve as a temporary hospital.Following the 26 August 1931 revolt, the revolutionary airman José Manuel Sarmento de Beires (who along with António Jacinto de Silva Brito Paes, had completed a circumnavigation from Lisbon to Maucau on 2 April 1924) left the air base at Alverca, to bomb the fortification.