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Although Britain started blockading Germany from the beginning of WWI,
the allies did not a complete a mine barrage between Scotland and
Norway until early 1918 (or possibly late 1917)?

What effect, if any, did this marine obstacle course have on German
surface and subsurface operations, and on blockade-operations, and
neutral commerce? Did it have marginal utility in reinforcing the
blockade, or was it just an ostentatious demonstration of naval
superiority that was a waste of effort?
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