The episode features historians Dominic Sandbrook and Tom Holland examining the pivotal events of May 1940, when Hitler's invasion of Western Europe coincided with Winston Churchill's emergence as British Prime Minister.

The discussion opens with Churchill's first radio address on May 19, 1940, delivered just nine days into his premiership against the backdrop of catastrophic Allied defeats in France and the Low Countries.

The narrative traces Hitler's strategic planning from the Winter War in Finland through the invasion of Scandinavia, revealing how German success in Norway—despite Allied incompetence—set the stage for the decisive Western offensive.

The hosts explore the Manstein Plan's revolutionary "sickle-cut" strategy through the Ardennes, the collapse of French defenses at Sedan, and the encirclement of Allied forces that would lead to Dunkirk, drawing on military records, personal diaries, and eyewitness accounts to illuminate this turning point in World War II.

The Winter War and Soviet Weakness

Stalin attacked Finland in November 1939 after demanding territorial concessions in Karelia, but the Red Army proved catastrophically unprepared despite Russia's reputation for winter warfare

Soviet losses totaled 125,000 killed and 300,000 incapacitated by wounds, disease, or frostbite, while Finnish forces used white camouflage, skis, and Molotov cocktails to devastating effect

Hitler observed the Winter War closely, concluding that "we have only to kick in the door and the whole rotten structure of the Soviet Union will come crashing down" - a belief that would shape his 1941 invasion plans

The Battle for Scandinavian Iron Ore

By December 1939, British intelligence calculated that 9.5 million of Germany's 22 million tons of imported iron ore came from sources now closed, making Swedish supplies through Norway's port of Narvik absolutely critical to the Nazi war machine

Grand Admiral Raeder warned Hitler that the Allies would use Finland as a pretext to occupy Norway and Sweden, cutting off German iron ore supplies. Both sides simultaneously planned invasions, each ignorant of the other's preparations

Hitler gave General Falkenhorst until 5 PM the same day to devise Norway's invasion plan. Falkenhorst bought a Baedeker guidebook, checked into a hotel, and drafted the operation using only tourist information

Vidkun Quisling, leader of Norway's fascist Nationale Samling party with only 2.5% electoral support, provided Germans with detailed defense information as former defense minister, establishing his name as synonymous with treason

Norwegian Resistance and Allied Incompetence

When King Haakon VII was woken at 1:30 AM on April 9, 1940, and told "Majesty, we're at war," he asked "with whom?" because Norwegians couldn't tell if Britain or Germany was invading

Norway's Commander-in-Chief General Larker ordered mobilization by postal letters, then left headquarters to collect his "toilet dress" from his farm. His taxi was delayed by the invasion, and he eventually took a tram and walked to rejoin his staff hours later

Norwegian fortress Oskarsborg used two 19th-century antique cannons to sink the German cruiser Blücher, killing 800 troops and buying crucial time for King Haakon and ministers to evacuate Oslo with gold reserves

King Haakon refused German demands to accept Quisling's puppet government, declaring "If you want to accept it, fine, but I will abdicate. I will never ever preside over a Quisling government" before bursting into tears

The British campaign was characterized by "moral ignobility and military incompetence" - Max Hastings. Territorial battalions lacked maps, radios, heavy weapons, and proper footwear. Admiral Lord Cork fell into a snowdrift while trying to inspire troops

When Britain and France withdrew from Norway, Norwegian Commander Otto Ruge said bitterly: "So Norway is to share the fate of Czechoslovakia and Poland" - establishing that Allied promises meant nothing

Denmark's Five-Hour War

Germany invaded Denmark at 4:15 AM on April 9, 1940. King Christian X ordered a ceasefire by breakfast, and Denmark signed capitulation at 10 AM - making it the shortest campaign in history at 5.75 hours

King Christian X stayed in Copenhagen because Crown Princess Ingrid was nine months pregnant and couldn't travel. He rode daily through the city on horseback as a symbol of resistance, and told Germans that if Danish Jews were forced to wear yellow stars, "I will wear one too, and all my people will wear them"

Churchill's Rise from Norway's Ashes

Churchill bore primary responsibility for the Norway disaster as First Lord of the Admiralty, yet Chamberlain carried the political blame after declaring on April 3 that "Hitler has missed the bus"

During the Norway debate on May 7, 1940, Conservative MP Leo Amery pointed at Chamberlain and quoted Cromwell: "In the name of God, go." Over 100 Conservative MPs deserted the government the next evening

On May 9, Chamberlain resigned and told George VI to send for Churchill. That same evening, Hitler's armored train "America" left Berlin heading west, switching from northbound to westbound tracks near Hanover

The Manstein Plan and Allied Delusions

Germany's initial plan mimicked the 1914 Schlieffen Plan - attacking through Belgium and Holland. Hitler rejected it as unoriginal, demanding "speed and surprise"

General Manstein proposed concentrating panzers through the Ardennes Forest for a surprise attack, then executing a "sickle-cut" north to the Channel. The High Command dismissed this and sent Manstein to East Prussia to silence him

On January 10, 1940, a Luftwaffe plane carrying Major Reinberger and the original German plans crashed in Belgium. Reinberger tried destroying documents in a stove, then burst into tears and attempted suicide. The Allies believed they now knew Germany's strategy

Hitler's adjutant invited Manstein to the Reich Chancellery on February 17. Despite distrusting the "cold, arrogant Prussian aristocrat," Hitler loved the plan: "I've been gagging to hear a plan like this. Through the Ardennes, surprise attack, reckless. I love it"

General Guderian had published Achtung Panzer two years earlier, detailing the strategy of separating fast-moving panzer divisions from slower infantry. The French never read it

The Myth of German Superiority

France had 3,000 tanks versus Germany's 2,000, more artillery, and equal divisions (90 German, 90 French, plus 10 British). The Allies actually had more planes overall than the Luftwaffe

Only half of German troops had more than a few weeks' training, over a quarter were over 40, and German artillery was designed to be drawn by horses. Of 135 divisions earmarked for France, only 10 were panzer and only 6 fully mechanized

Nazi propaganda created a "Potemkin quality" to German militarism - the appearance of overwhelming mechanized superiority that didn't match reality but psychologically devastated opponents

General de Gaulle later observed: "We've gone to war with a 1918 army against the German army of 1939" - true in attitude though not equipment

Blitzkrieg Through the Ardennes

At dawn on May 10, 1940, Hitler's train arrived at Felsennest (Rock Eyrie) near the Belgian border. Through the woods, they heard shellfire. Hitler announced: "Gentlemen, the offensive against the Western powers has begun"

General von Kleist led 134,000 soldiers, 1,200 tanks, and 500 armored vehicles through the Ardennes in four columns creating "the longest traffic jam in history" - hundreds of miles of tanks, wagons, horses, and troops on narrow forest roads

The French Air Force never attacked this vulnerable column despite knowing its location. If they had, the war would have been over. German troops were issued amphetamines and ordered not to stop for three days

On May 13, General von Kleist called up 1,000 planes to support the Meuse River crossing. For French troops experiencing their first air attack, the psychological impact was devastating - soldiers cowered sobbing in trenches, morale shattered

When told Germans were crossing the Meuse, French Second Army commander General Huntziger replied: "Brilliant. All the more prisoners for us" - epitomizing French complacency

The Collapse of France

By May 15 - just five days into the invasion - Paul Reynaud called Churchill at 7:30 AM and said in English: "We have been defeated. We are beaten. We have lost the battle." Churchill replied: "Surely it can't have happened so soon"

Churchill flew to Paris on May 16 and found them burning archives, preparing to evacuate. When he asked General Gamelin "where is your strategic reserve?" Gamelin replied "Aucun" - there isn't any

Eight million French civilians fled their homes, clogging roads with possessions, wagons, bicycles, and livestock. This made it impossible for French armies to maneuver, while Stukas dive-bombed the refugee columns

Reynaud sacked Gamelin on May 19, replacing him with 73-year-old General Weygand, who had been retired for five years. Weygand proposed counter-attacks but the Allies were already in chaos

French commander in Belgium, General Billotte, burst into tears when told to coordinate Allied response. British Chief of Imperial General Staff Sir Edmund Ironside "lost my temper and shook Billotte by the button of his tunic. The man is completely beaten"

On May 21, General Weygand flew to meet Billotte but found the airfield deserted except one soldier. He persuaded the soldier to drive him to a post office to call for a car, then insisted on stopping for an omelette before the meeting. Billotte's car crashed afterward; he fell into a coma and died two days later. British Chief of Staff Sir Henry Pownall said: "Frankly, he's no loss"

The Sickle-Cut Closes

On the night of May 19, as Churchill broadcast to Britain for the first time as Prime Minister, the first German panzers reached the mouth of the River Somme on the Channel coast

By May 20, the "sickle-cut" was complete. Three French armies, the Belgian army, and the entire 400,000-man British Expeditionary Force were encircled and trapped against the sea in a shrinking pocket

Hitler had predicted victory in six weeks. After just 11 days, it was clear the Allies had collapsed. The panzers were closing in on the Channel ports of Boulogne, Calais, and Dunkirk

Hitler's gamble - bigger and more reckless than any before - was succeeding beyond even his predictions. The question now: would Britain be forced to sue for peace?