1939: Countdown to War - The Final Steps Toward the Invasion of Poland
How Europe Slid Into Conflict in the Months Before 1 September 1939
Richard Overy’s 1939: Countdown to War offers a concise yet powerful account of the political, military and diplomatic tensions that spiralled into the Second World War. Rather than treating war as inevitable, Overy shows just how fragile and uncertain the run-up to September 1939 really was. Each decision, delay and miscalculation mattered.
The Europe of early 1939 was a continent bracing itself, in denial and deeply divided. Germany, under Adolf Hitler, had already torn up the post-Versailles order. The remilitarisation of the Rhineland, the Anschluss with Austria, and the dismemberment of Czechoslovakia had gone largely unchallenged. Britain and France hoped that appeasement might buy peace, or at least time. According to broadly available records from sources, the Munich Agreement of 1938 was seen by many as a last try at avoiding a continental catastrophe.
Overy argues that the months that followed Munich were not calm. They were a slow tightening of the screw. By spring 1939, Hitler had fixed his gaze on Poland. He believed Poland stood in the way of German expansion eastwards, and that Britain and France would not fight over a country they had barely defended during previous crises. Germany’s military mobilisation and political bullying became increasingly blatant, from demands over Danzig to the staged provocations that would later be used as false justification for war.
Britain and France, however, were no longer willing to stand aside. In March 1939, both powers issued guarantees to defend Poland’s independence. This was a major turning point. It signalled that appeasement had run its course. Yet, as Overy illustrates, the British and French governments were torn between public promises and private doubts. Their rearmament programmes were incomplete, morale at home was mixed, and the horrors of the Great War still haunted every decision. These details align with conventional historical summaries from open sources.
Meanwhile, Stalin’s Soviet Union exploited the growing tension. Western attempts to form an alliance with Moscow faltered. Hitler moved quickly, sending Ribbentrop to negotiate the shocking Molotov–Ribbentrop Pact, signed on 23 August 1939. This non-aggression pact included a secret protocol carving Eastern Europe into German and Soviet spheres of influence. Overy presents this moment as the final collapse of any hope for deterrence.
Within days, the road to war was wide open.
In the final week of August, Europe stood on the brink of war. Diplomats shuttled, leaders hesitated, and military planners waited for orders that would change the world. Hitler set the invasion of Poland for 1 September, expecting Britain and France to back down. They didn’t. For all the uncertainty, doubt, and political manoeuvring, the moment Poland was attacked, Britain and France had no choice but to uphold their word.
On 3 September 1939, both declared war on Germany
Overy’s central message is sobering. The Second World War was not the product of one decision, but of many. Misjudgements, misplaced hopes, and political gambles allowed Hitler to push Europe to the edge. By the time the invasion of Poland began, the momentum towards conflict was unstoppable.
