When the United States entered the Second World War, American air power was still developing. Four years later, the United States was operating thousands of aircraft, supported by an enormous industrial and technological effort, and had produced the B-29 Superfortress, the most advanced bomber of the war.

At the centre of that transformation was General Henry "Hap" Arnold.

Arnold had been involved in American military aviation from its earliest days, and during the Second World War he became the driving force behind the expansion of the US Army Air Forces. The B-29 was perhaps his greatest gamble. It was enormously expensive and technologically ambitious, and Arnold was prepared to push American industry to build an aircraft that did not yet exist.

The result was the Superfortress, a bomber capable of flying farther, higher and carrying a heavier bomb load than anything that had come before it. Ultimately, B-29s would carry the atomic bombs that destroyed Hiroshima and Nagasaki.

Today I'm joined by A. J. Baime, author of "Bird Men: The Rise of American Airpower and the Machine That Ended World War II", to look at Hap Arnold, the rise of American air power and the extraordinary story of the B-29 Superfortress.

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Today we're going to Warsaw, a city caught between Nazi Germany and the Soviet Union, and a city whose people endured occupation, persecution, resistance and ultimately almost total destruction.

From the invasion of 1939, through the Warsaw Ghetto Uprising and the Warsaw Uprising of 1944, we'll explore what happened to the city and its inhabitants during the Second World War.

To tell that story, I'm joined by historians Prit Buttar and Lottie Taylor, authors of 'Warsaw: A City at War, 1939–45'.

Warsaw: A City at War, 1939–45 is also available on Audible and Spotify.

In 1938, Europe was once again facing the prospect of a major war.

The immediate crisis centred on Czechoslovakia, a new state created at the end of the First World War. It was a country with a substantial industrial base, a significant arms industry and, importantly, a heavily fortified frontier with Germany.

Hitler was determined to destroy Czechoslovakia. The German military had drawn up an invasion plan known as Fall Grün, or Case Green. But there was a problem. The German armed forces were not yet ready for the kind of major European war that Hitler seemed to be risking.

So what exactly was Case Green? How did the Germans intend to defeat Czechoslovakia, how good were the Czech defences, and how did Hitler's ideas differ from those of his own generals?

And perhaps most importantly, what might actually have happened if Britain and France had refused to compromise and Germany had gone to war?

Today I'm joined by Robert Forczyk, whose book 'Case Green: The Birth of the Wehrmacht' examines the German plans for the invasion of Czechoslovakia in 1938.

Case Green is also available on Audible and Spotify.