British steamer involvement in the Portuguese Civil War, 1828-1834

Abstract

In the Portuguese Civil War (1828–1834), up to 16 British packet steamers were chartered, not only for the transport of mercenaries, troops and supplies, but also for two rather more unusual missions. The decisive battle, which took place off Cabo São Vicente on 5 July 1833, involved the somewhat reluctant participation of the crews of four British steamers, the encounter nevertheless indicating the potential effectiveness and reliability of steam power in military engagements. Cabo São Vicente is regarded as the last naval conflict in which sail enjoyed supremacy over steam.