France and Coastal Artillery

Ok I have read over the pass few weeks a short AH book called Gray Tide in the East, which is a fairly belivable account of what would happen had the Kaiser called off the plan attack through Beligum. But there are a few issues I see wrong with it. On land its fairly believable, but the naval end isn't so much. I have been thinking about doing my own verison of this book but with a much changed naval side. Also a few changes to the Americans who are in Germany at the time.

But I'm trying to rundown French Coastal Artllery and where said artillery was at. So far when I use google all I get is the story of US coastal artillery in France in WW1. I would like to know of any good sights about French Coastal Artillery.
 
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