Captain John Henry Watson was an Irish champion polo player.Horace A. Laffaye, Polo in Britain: A History, Jefferson, North Carolina: McFarland & Co., 2012, p. 33 He won the International Polo Cup in Newport, Rhode Island in 1876 alongside Captain Thomas Hone, Malcolm Orme Little, and Captain the Hon. Richard Lawley, 4th Baron Wenlock.
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