What assistance did Mahan and Roosevelt contribute to The Royal Navy?
Short answerThey are thought to have exchanged letters with its author about particular historical points, though the exact contribution is uncertain.
NotesA title-page acknowledgement in The Royal Navy lists Mahan and Roosevelt as assistants. Their contribution is tentatively recalled as correspondence with the author about particular historical points, with letters sent and replies received. The precise material or advice they supplied is not identified.