Montague was born and brought up in London, the son of an Irish Roman Catholic priest who had left his vocation to marry.
[5] During this time, Montague wrote William Thomas Arnold (1907), a biography of the titular journalist, with Mary Augusta Ward.
[2] Montague was against World War I prior to its commencement, but once it started he believed that it was right to support it in the hope of a swift resolution.
H. W. Nevinson would later write that "Montague is the only man I know whose white hair in a single night turned dark through courage."
Mencken stated about the novel that "Montague manages the difficult business superbly...it is a charming and uproarious piece of buffoonery, carried on with the utmost dexterity from start to finish.
[10] Disenchantment was also lauded by H. G. Wells, George Bernard Shaw, H. M. Tomlinson, Christopher Morley, Heywood Broun and Dorothy Canfield.
[11][12][13] Literary critic Harry Hansen lauded The Right Place as "the sort of book that one can open at dawn and at dusk, and find solace therein" and called Montague "a brilliant English journalist.
Montague's short story "Judith" was adapted as the 1929 Hollywood film True Heaven, directed by James Tinling.