The Genius of the Marne is a play written by John Lloyd Balderston in 1919. The play is set during World War I and revolves around the Battle of the Marne, a pivotal moment in the war. The play is divided into three scenes, each depicting a different aspect of the battle. The first scene shows the planning and strategy of the French and British forces, led by General Joffre and Sir John French, respectively. The second scene takes place on the battlefield,...