It was not until 1937 that Jones published his first literary treatment of the conflict that would shape his life. Jones began seriously writing "In Parenthesis" in 1928, drawing on the first seven months of his experiences in the War, culminating in the attack and heavy casualties of his unit in Mametz Wood. "In Parenthesis", which was published by Faber and Faber with an introduction by Jones's good friend and champion T. S. Eliot, is a dense mixture of verse and prose-lines but the richness of the language establishes it as poetry, which is how Jones himself considered it. Jones's literary debut won high praise from critics and from fellow-poets such as Eliot and W.B. Yeats, as well as garnering the Hawthornden Prize in the following year. Jones's style can be described as High Modernism; the poem draws on literary influences from the 6th-century Welsh epic "Y Gododdin" to Shakespeare's "Henry V", Thomas Malory's "Morte d'Arthur", the poetry of Gerard Manley Hopkins and "Anabase" by Saint-John Perse (translated by Eliot) to try to make sense of the carnage he witnessed in the trenches. An extract from "In Parenthesis" read by Jones himself in 1967 appears on the audiobook CD "Artists Rifles".