The Siege of Porto is considered the period between July 1832 and August 1834 in which the troops of Dom Pedro remained besieged by the forces of Dom Miguel I of Portugal. The resistance of the city of Porto and the troops of Dom Pedro made the victory of the liberal cause in the Kingdom of Portugal possible. Those that fought in the Siege of Porto on the Liberal side include Almeida Garrett, Alexandre Herculano and Joaquim António de Aguiar.