The Siege of Lisbon, from July 1 to October 25, 1147, was the military action that brought the city of Lisbon under definitive Portuguese control and expelled its Moorish overlords. The Siege of Lisbon was one of the few Christian victories of the Second Crusade—it was "the only success of the universal operation undertaken by the pilgrim army," i.e. the Second Crusade, according to the near contemporary historian Helmold, though others have questioned whether it was really part of that crusade. It is seen as a pivotal battle of the wider Reconquista.