Atholl Laurence Cunyngham Forbes, 21st Lord Forbes

In 1905, at the age of 22, Forbes joined the 2nd Battalion Grenadier Guards, later becoming adjutant of the 3rd Battalion Grenadier Guards and then Regimental Adjutant. He was posted to the staff of Headquarters London District before joining the staff of XIV Corps in France. After recoverng from an illness in 1917, he was given command of the Reserve Battalion Grenadier Guards till 1919, when he resigned his commission with the rank of Major.