In the autumn of 1962 Gwyn Thomas, author of The Keep and Jackie the Jumper, two plays already staged at the Royal Court, delivered to the Theatre Royal, Stratford East, his script of Sap, a play with songs about the First World War. In March 1963, Joan Littlewood premiered at the Theatre Royal Oh What a Lovely War. Subsequently, Thomas felt that his ideas and research had been stolen, and because of the success of Oh What a Lovely War, Sap was not staged for another eleven years. In this article Gwynne Edwards discusses the circumstances surrounding these events and outlines the similarities and differences between the two plays. Gwynne Edwards has written extensively on Spanish theatre, in particular on the plays of Lorca, which he has also translated. More recently he has written plays based on the lives and work of Dylan Thomas, Gwyn Thomas, and Richard Burton. Burton was staged in Hollywood in 2010.