A century ago, John Maynard Keynes entered the Treasury to serve his country during the First World War, but as is well known, appalled by the terms of the end-of-war Treaty of Versailles, he abandoned the British delegation, outlining the predictable adverse results in the Economic Consequences of the Peace, published in 1919. Far less well known is his personal and political development that led him to be called to service even before Great Britain entered the conflict.