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But the British aerial mine defused on Sunday was one of the biggest found in the country, and its defusal caused disruption across the city of Koblenz.

Britain's tribute to the effectiveness of this campaign has been her effort to retaliate by sending bombers across the North Sea to Helgoland and Sylt, the aerial mine layers' bases.

The pilot's companion in the latter immediately prepares his aerial mine, fixing the detonator, and attaching the mine to the wire.