Roberts, Andrew. "Prime Minister Halifax"
Divergence: 1940 CE
What if: Halifax became prime minister in May 1940 rather than Churchill, and soon agreed to an armistice with Germany when faced with the threat of destruction of the British Expeditionary Force at Dunkirk.
Published: In What If? 2: Eminent Historians Imagine What Might Have Been (ed. Robert Cowley), q.v.