Mobile Defense

If my translation is correct, that bit of type on the top of the card reads, Algeria, the admiralty and the mobile defense.  This card was published by "LEVY ET NEURDEIN REUNIS."   Levy and Neurdein was in business from 1920 to 1932.  It was a company that was formed when Levy & Sons merged with Neurdein et Cie.  Algeria, of course, was once part of France.  My guess is that the patrol boats seen in this card were part of the French equivalent of the coast guard.  There was once a major French naval base at Mers-a-Kebir on the Algerian coast.  After the fall of France, and the formation of non occupied France, the British government demanded that the French fleet in north Africa head to England and join in the fight against the Germans.  When Admiral Darlan of the Vichy government declined but promised that the French fleet would never be surrendered to the Nazis, Churchill ordered an attack that sank the fleet, killing thousands of French sailors.  Latter, when the Germans tried to seize the rest of the French fleet at Toulon,  Darlan ordered the scuttling of his ships. 

Now, for a movie recommendation,  The Battle of Algiers.  It'll help explain why Algeria is no longer part of France.