Part One: The true story of the discovery of 'fixation' -- Robert Le Rossignol The early years, Victoria College, UCL and Ramsay -- Fritz Haber and Karlsruhe Breslau to Karlsruhe ... an unexpected journey -- Germany and 'fixation' Of the 'Prussian', Chile, and 'fixed' nitrogen -- The Golden Chemist Robert's 'ammonia apprenticeship' at UCL -- Hamburg, May 12th 1907 The Bunsen Society Meeting -- Determination of the ammonia equilibrium under pressure -- Taking care of business Haber's contracts with the BASF and Le Rossignol -- 8. The 'Big Fix' Synthetic ammonia at Karlsruhe -- Part Two: The industrialisation of 'fixation' and the Great War -- The Auergesellschaft, Berlin Tungsten filaments and a pawn in a power game -- Of Koppel and the Kaiser Progress at the BASF, 'fixation' revealed, and the Kaiser Wilhelm Institute, Berlin -- From Karlsruhe to Oppau Industrialisation of the Haber-Le Rossignol process -- Berlin, 1911-1914 Of patents, publications and the prelude to the Great War -- Haber and the 'Chemists' War'. 1914-1918 Fixation' and gas warfare -- Robert's war. 1914-1918 Internment at Ruhleben, release to the 'Auer' and finally home -- Part Three: The GEC Laboratories, the second world war and retirement -- The Post-War Years, 1919-1930 Of airships, unfinished business from Germany and the GEC Laboratories -- The Post-War Years, 1930-1939 Of CATs, Cambridge and the BBC -- The Second World War and immediate post-war years. 1939-1949 Wembley at war, 'St Helier' and retirement -- Penn, Buckinghamshire. 1949-1976 Retirement years, 'coming out' and remarkable benevolence -- February 2012 A personal pilgrimage to Penn to meet with some who still remember the Le Rossignols -- End Notes and References -- Appendix A: Heat capacity and enthalpy -- Appendix B: The Third Law in action; thermodynamics of the n-butane to iso-butane isomerism -- Appendix C: The Nernst approximation formula -- Appendix D: The Haber(-Le Rossignol) equations 1907-1914 -- Appendix E: Thermionic valves -- Appendix F: Robert Le Rossignol's patents. 1909-1956.