The Silver Tassie (play) play's study of Harry’s loss of many of his life’s hopes during and after the war, marks it as unusual. In 1928, W. B. Yeats rejected the play for the Abbey Theatre in Dublin. It premièred at the Apollo Theatre in the West End of London on 11 October 1929. It was directed by Raymond Massey and starred Charles Laughton and Barry Fitzgerald. The set design for act two was by Augustus John. It ran for twenty-six performances. George Bernard Shaw and Lady Gregory were both great admirers of the production. Its Irish première was on 12 August 1935 at
Mary Devenport O'Neill Colum, W. B. Yeats, Richard Irvine Best, Frank O'Connor, Francis Stuart and Iseult Gonne. She became particularly close to Yeats, who she confided in. Yeats' recorded their weekly consultations in his diary while O'Neill was writing "A vision" (1925). In his "Oxford anthology of English verse" from 1936, he included one of O'Neill's poems. In 1917, she contributed lyrics to her husband's play "The kingdom maker". She published her only book in 1929, "Prometheus and other poems". After this she occasionally contributed primarily modernist plays and poetry to "The Dublin Magazine", "The Irish Times" and "The Bell". O'Neill collaborated with