Pierre Alexis Ronarc'h
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He is notable for commanding the French Brigade de fusiliers marins at the Battle of the Yser in 1914 during the First World War. Between 1915 and 1919 he is in command of the naval forces between Nieuwpoort (Belgium) and Antifer (north of Le Havre), called the Zone des Armées du Nord (ZAN). Based in Dunkirk, his mission is to keep German Navy ships and submarines out of the Dover Channel, in close collaboration with the British Dover Patrol.
In May 1919, the ZAN is dissolved and Ronarc'h becomes Chief of Staff of the French Navy, a post he holds until 1 February 1920, when he is replaced by Henri Salaun.