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In this thread I wish only to talk about naval matters and coastal defenses.
With this in mind, what would the naval war in Europe look like if the German lines were based on the Somme river? This would mean that the entire coast from Abbeville to the Netherlands would be in German hands. What does this mean for the British, for the French, and for the Germans?
Is the High Seas fleet more active and based further forward? Is the Grand Fleet based in the Channel?

What kind of coastal defenses would the Germans need to protect the coast line and would the British try or even be able to land and open up a new front? Can Germany turn the Channel into a hunting ground? What about the Dover mine barrage; here it can't exist, so is something like it created in this scenario?
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