Meanwhile, in August 1627 French royal forces started to surround La Rochelle, with an army of 7,000 soldiers, 600 horses, and 24 cannons, led by
Charles of Angoulême. They started to reinforce fortifications at Bongraine (modern
Les Minimes), and at the
Fort Louis. On September 10, the first cannon shots were fired by La Rochelle against royal troops at Fort Louis, starting the third
Huguenot rebellion. La Rochelle was the greatest stronghold among the Huguenot cities of France, and the centre of Huguenot resistance. Cardinal Richelieu acted as commander of the besiegers when the King was absent. Once hostilities started, French engineers isolated the city with
entrenchments long, fortified by 11 forts and 18 redoubts. The surrounding fortifications were completed in April 1628, manned with an army of 30,000. Four thousand workmen also built a
seawall to block the seaward access between the city and harbor, stopping all supplies. The initial idea for blocking the channel came from the Italian engineer
Pompeo Targone, but his structure was broken by winter weather, before the idea was taken up by the royal architect
Clément Métezeau in November 1627. The wall was built on a foundation of sunken hulks filled with rubble. French artillery battered English ships trying to supply the city. Meanwhile, in southern France,
Henri de Rohan vainly attempted to raise a rebellion to relieve La Rochelle. Until February, some ships were able to go through the seawall under construction, but after March this became impossible. The city was completely blockaded, with the only hope coming from possible intervention by an English fleet.
Foreign support for the French Crown Dutch support The Roman Catholic government of France rented ships from the Protestant city of
Amsterdam to conquer the Protestant city of La Rochelle. This resulted in a debate in the city council of Amsterdam as to whether the French soldiers should be allowed to have a Roman Catholic sermon on board of the Protestant Dutch ships. The result of the debate was that it was not allowed. The Dutch ships transported the French soldiers to La Rochelle. France was a Dutch ally in the war against the
Habsburgs.
Spanish alliance In the occasion of the siege of La Rochelle, Spain manoeuvered towards the formation of a Franco-Spanish alliance against the common enemies that were the English, the Huguenots, and the Dutch. Richelieu accepted Spanish help, and a Spanish fleet of 30 to 40 warships was sent from Corunna to the
Gulf of Morbihan as an affirmation of strategic support,
Third La Rochelle expedition A third fleet was dispatched under the Admiral of the Fleet, the
Earl of Lindsey in September 1628, In September 1628, the English fleet tried to relieve the city. After bombarding French positions and failing to force the sea wall, the English fleet had to withdraw. Following this last disappointment, the city surrendered on 28 October 1628. ==Epilogue==