World War II: Allied forces attacked German fortifications at Saint-Malo, France, beginning the Battle of Saint-Malo (pictured).

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.

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.

Saint-Malo is a historic French port commune in Ille-et-Vilaine, Brittany.

The Battle of Saint-Malo was fought between Allied and German forces for control of the French coastal town of Saint-Malo in Brittany during World War II. The battle was part of the Allied breakout across France and took place between 4 August and 2 September 1944. United States Army units, with the support of Free French and British forces, successfully assaulted the town and defeated its German defenders. The German garrison on a nearby island continued to resist until 2 September.