The World Peril of 1910 by George Griffith

At daybreak on the nineteenth, to the utter amazement of everyone who was not "in the know," the Imperial yacht, _Hohenzollern_, was found off Tilbury, flying the Imperial German Ensign and the Naval flag, as well as a long string of signals ordering the aerial bombardment of London to cease, and all the _Flying Fishes_ to return at once to Canterbury.

The apparent miracle had been accomplished in an absurdly easy fashion. About nine a.m. on the eighteenth a German orderly went into the post-office at Dover and handed in an official telegram signed "Von Roon," ordering the _Hohenzollern_ to come round at once to Dover, as she was considered too open to attack there.