The Anglo-Spanish war of 1625 to 1630 formed part of the Thirty Years' War, which raged between 1618 and 1648, involving most of the countries and Europe and proving one of the bloodiest and most destructive conflicts Europe ever encountered until the twentieth century.

James I declared war on Spain in March 1624, shortly before his death. England was an ally of the United Provinces, the Protestant breakaway state of the Netherlands, the remainder of which was still a Spanish possession. However, no military action was taken until the following year, when, under the new monarch Charles I, an English relief force attempted but failed to support the Dutch at the Siege of Breda. Later that year, another force embarked for Spain in the Cadiz Expedition. Ultimately, this war saw victory for

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