During World War I he initially enlisted in the Artists Rifles, and was then released from military service to manage a shell factory.
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Cortege also appears on Artists Rifles, an audiobook CD issued in 2004 featuring war poetry read by Siegfried Sassoon, Edmund Blunden, Robert Graves, David Jones, Edgell Rickword and Lawrence Binyon, as well as music by Edward Elgar, George Butterworth, Ralph Vaughan Williams, Maurice Ravel, Gustav Holst, Ivor Gurney, Ernest Moeran and Arthur Bliss.