Britain combined industrial and agricultural capacity with ports safely removed from the battlefield yet close to northern France. Channel shipping carried supplies to the front and returned wounded personnel for treatment. The short sea route could be more direct than moving the same cargo north through the French transport network. Strategically, sealing this southern exit from the North Sea also made the Grand Fleet's northern position at Scapa Flow meaningful; leaving the Channel open would leave another route around the blockade.
Chapter · 34:19-37:37
Why English Channel control sustained the Western Front
Britain's ports and industry made the short Channel crossing a protected logistics bridge for troops, supplies, and wounded personnel.