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Harrie Irving Hancock (January 16, 1868 - March 12, 1922) was an American chemist and writer, mainly remembered as an author of children's literature and juveniles in the late 19th and early 20th centuries, and as having written a fictional depiction of a German invasion of the USA.
I found it interesting reading about the technology of destroyers and submarines during World War I ... but the story was not credible. No destroyer sank as many submarines as Darrin does in this novel.