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In page Kathleen Cavendish, Marchioness of Hartington:

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Kathleen, now Marchioness of Hartington, and Lord Hartington spent less than five weeks together before he went off to fight in France. Four months after their marriage, and less than a month after Joe Jr. was killed, Hartington was killed by a sniper during a battle with the Germans in Belgium. With his family's blessing, he was buried close to where he fell. His younger brother Lord Andrew Cavendish, who was married to Deborah Mitford, youngest of the Mitford sisters, thus became the heir apparent to the dukedom, as Billy Hartington had left no heir. From then on she was styled as Kathleen, Dowager Marchioness of Hartington.[citation needed]