The Anglo-French War of 1627-1629 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.
Although Charles I had married a French princess, Louis XIII's sister Henrietta Maria, in 1625, this amity between England and France did not last long, and France made a secret alliance with Spain the following year. Louis XIII undertook a deliberate policy of suppressing the French Protestants, the Huguenots, and in 1627 begin a siege of La Rochelle, the Huguenot stronghold. Charles I sent three separate fleets to try to relieve the Huguenots, but failed on each occasion. Eventually, in 1629 England signed a peace treaty with
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