Sir Henry Wilson, Rt. Hon. David Lloyd George, Philip Noel-Baker, Alan Clark, Engelbracht and Hanighen, Siegfried Sassoon, Sir Philip Gibbs, Edmund Blunden, Leon Wolff, Captain Liddell Hart, Barbara Tuchman, Herman Kahn, the London newspapers Times and Doily Express.
Oh! What a Lovely War was partly improvised by its cast and director, then assembled into a collage depicting the horrors of World War I through period songs and words borrowed from official records, war memoirs, and personal recollections. Almost everything in the show was actually written or spoken between 1914 and 1918. A powerful anti-war piece and a scathing indictment of military blunders and the futile loss of lives, the material of Oh! What a Lovely War was presented within the framework of an English seaside entertainment, called a Pierrot show, and featuring a master of ceremonies.