On 13 Oct 1914 Maximilian Friedrich Hesse-Kassel (age 19) was killed.

In 1915 Yvo Alan Charteris (age 19) was killed during the First World War.

On 02 Oct 1915 Ninian Edward Crichton-Stuart (age 32) was killed during the First World War.

In 1916 Hugo Francis Charteris (age 32) was killed at Egypt during the First World War. On 12 Jul 1937 His son David Charteris 12th Earl Wemyss (age 3) succeeded 12th Earl Wemyss.

On 12 Sep 1916 Friedrich Wilhelm Hesse-Kassel (age 22) was killed.

On 06 Aug 1917 Gavin William Esmond Elliot-Murray-Kynynmound (age 22) was killed during the First World War.