World War I: The civilian authorities of Antwerp surrendered and allowed the German army to capture the city.

World War I or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Main areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. There were important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, plus another 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

Antwerp is a city and a municipality in the Flemish Region of Belgium. It is the capital and largest city of Antwerp Province, and the third-largest municipality in Belgium by area at 208.22 km² (80.39 sq mi). With a population of 565,039, it is the most populous municipality in Belgium, and with a metropolitan population of over 1.2 million people, the country's second-largest metropolitan area after Brussels.

The siege of Antwerp was an engagement between the German and the Belgian, British and French armies around the fortified city of Antwerp during the First World War. German troops besieged a garrison of Belgian fortress troops, the Belgian field army and the British Royal Naval Division in the Antwerp area, after the German invasion of Belgium in August 1914. The city, which was ringed by forts known as the National Redoubt, was besieged to the south and east by German forces.