Second World War: British troops began their withdrawal from the Battle of Arnhem in the Netherlands, ending the Allies' Operation Market Garden in defeat.

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

Operation Berlin was a night-time evacuation of the remnants of the beleaguered British 1st Airborne Division, in German-occupied territory north of the Lower Rhine in the Netherlands during Operation Market Garden in the Second World War. The aim of the operation was to withdraw the remnants of the division while covered by the 1st Polish Parachute Brigade and surrounded on three sides by more German troops with more heavy equipment and tanks and being in danger of encirclement.

The Battle of Arnhem was fought during the Second World War, as part of the Allied Operation Market Garden. It took place around the Dutch city of Arnhem and vicinity from 17 to 26 September 1944. The Allies had swept through France and Belgium in August 1944, after the Battle of Normandy. Market Garden was proposed by Field Marshal Sir Bernard Montgomery, who favoured a single push northwards over the branches of the Lower Rhine River, allowing the British Second Army to bypass the Siegfried Line and attack the important Ruhr industrial area.

The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during World War II (1939–1945) to oppose the Axis powers. Its principal members were the "Big Four" – the United Kingdom, United States, Soviet Union, and China.