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Initial plan for the line was, AFAIK, to build up to the Channel but the Belgians didn't like having their frontier lined with fortresses and the French agreed to not build all the way if the Belgians built their fortresses on their territory instead.
However, Belgian fortresses were not up to the same standards.

So, is it feasible and what'd happen if the French just built their network all the way to Dunkerque?
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