He was commissioned a second lieutenant in the 7th (Militia) Battalion of the Rifle Brigade (The Prince Consort's Own) in 1901[2] and served in South Africa during the Second Boer War.
"[6] In the following years his designs included The Right to Kill, a melodrama set in Turkey staged by Sir Herbert Tree at His Majesty's Theatre;[7] and Charles Villiers Stanford's opera The Critic (based on Sheridan's play of the same name) at the Shaftesbury Theatre in 1916, of which The Times said, "Mr Hugo Rumbold apparently carries the 18th century atmosphere about in his pocket.
Some of Rumbold's costumes (for the "everyday young girls") were retained by the D'Oyly Carte Opera Company until Peter Goffin's new designs were introduced in 1957.
[10] For Sir Thomas Beecham, Rumbold designed revivals of La fille de Madame Angot, by Lecocq, and Mozart's Le Nozze di Figaro staged at the Theatre Royal, Drury Lane in 1919.
[15] This departure from his milieu was noted in his obituary notice in The Times, which said: "He was essentially a Bohemian and a clubman, who was witty and amusing and always tried to pass on his zest for life to others.... Later, he took to film-producing.
"[4] With Zoe Akins, he wrote The Human Elephant, a play in three acts adapted from the short story of that title by Somerset Maugham.