Less than twenty-one years separated the Armistice of November 1918 from the British Army's renewed commitment to a continental war in September 1939. Until 1931, the British Army could reasonably claim leadership in crucial areas of military theory and practice – most notably, in mechanization and in the development, organization, and employment of armored forces. After 1933, however, the British General Staff looked with an increasing fascination at the burgeoning power and skill of the German Army. For reasons to a certain extent beyond its control, it was unable to make an adequate response. By 1935, Britain's lead in the development of armored forces had clearly been lost. Desperately weak and unready in 1939, the British Army's performance for much of the Second World War was distinctly poor.

For much of the First World War, too, the British Army had struggled to bring itself up to the standards of competence of the French, much less the Germans. (The latter were undoubtedly the most efficient in the world until near the end of that conflict.) But British difficulties in achieving such standards are hardly surprising. The little army fielded in August 1914 was by no means a “contemptible force.” It was at least the qualitative equal of its vastly larger continental contemporaries. By year's end, however, the intense fighting had destroyed much of it.