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It's July 1st, 1863 and one small town in Pennsylvania is about to have its name etched into American folklore, Gettysburg. Over the course of the next three days, over 165,000 troops from the union and the Confederate forces would engage in the bloodiest battle of the American Civil War, and despite the conflict continuing for nearly two more years, the Battle of Gettysburg is considered a turning point, marking the end of General Robert E. Lee's plans to invade the North and bring the war to a close.

But what if things had been different and this epic clash of the ages had turned out differently? Today we're delving back into the History Undone archives, as James Hanson is joined by historian and author Rear Admiral Dr Chris Parry, and Dr Timothy Orr, Associate Professor of military history at Old Dominion University.

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James Hanson is joined by Drachinifel and Rear Admiral Dr Chris Parry to discuss the longest continuous battle of the Second World War: The Battle of the Atlantic.

Between 1939 and 1945 both merchant and navy ships were attacked in the vast expanse of the Atlantic Ocean. Yet after 5 years and 8 months, the might of the Royal Navy helped the allies win here. So what if the Germans had won? This is History Undone.

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The sixth of June 1944 D-Day 80 years on, is still the largest amphibious invasion of all time. It's a date that evokes emotion and national pride in equal measure, and it not only changed the Second World War, but history itself. Yet, what if the operation hadn't been a success?

Welcome to History Undone with James Hanson, the show where we take an alternative look at the events which have shaped our world. Each episode will focus on a different battle from throughout history, but using modern military analysis, we'll ask how things could have played out differently with a few tactical changes.

This week we're delving back into our archive, as James Hanson is joined by historian and researcher at The Tank Museum - Chris Copson, and former Amphibious Commander - Rear Admiral Dr Chris Parry, to investigate what would have happened if the offensive action at Omaha and other beaches had failed.

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By the summer of 1941 Nazi Germany is in near total control of continental Europe. A year earlier, the German blitzkrieg swept through Belgium, the Netherlands and France, and forced the British Expeditionary Force to evacuate at Dunkirk.

Then by 1941 Hungary, Romania and Bulgaria had all joined the axis, and Hitler looked further east despite a non aggression pact with Stalin's Soviet Union, Hitler saw his previous success as a blueprint to launch an operation which he thought could bring down the Red Army in a matter of months, codename Barbarossa. What followed was a brutal, drawn out strategic defeat, one which was perhaps the beginning of Hitler's downfall.

But what if Hitler had defeated Russia? This week we're delving back into our archives as James Hanson is joined by author and historian Rear Admiral Dr Chris Parry, and historian and former professor of international history at the University of Glasgow, Evan Mawdsley.

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James is joined by Rear Admiral Dr Chris Parry and the historian Tim Bouverie for this episode of History Undone, discussing the unlikely alliance of 'the big three' in the Second World War.

Britain, the United States and the Soviet Union were divided by culture and ideology, but united against a common enemy in Nazi Germany. Tim Bouverie joins the show to discuss the themes explored in his new book 'Allies at War: The Politics of Defeating Hitler' which is out now.

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