The island's value extends above the North Sea as fighter performance improves during the First World War. Aircraft based on Heligoland could meet German airships before they cross toward Britain, shifting air defence far east of the home islands. That threat might force Germany to build faster or heavier aircraft, suppress the island first, or reconsider the scale of its airship programme. These are branching procurement possibilities rather than a single certain outcome. A single forward base could therefore reshape an adversary's weapons choices beyond the naval sphere.
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Heligoland as a forward defence against Zeppelins
Fighters on Heligoland could intercept German airships near their own coast and alter the economics of the Zeppelin campaign.