World War I: British nurse Edith Cavell is executed by a German firing squad for helping Allied soldiers escape from occupied Belgium.

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.

Edith Louisa Cavell was a British nurse. She is celebrated for treating wounded soldiers from both sides without discrimination during the First World War and for helping some 200 Allied soldiers escape from German-occupied Belgium. Cavell was arrested, court-martialled under German military law and sentenced to death by firing squad. Despite international pressure for mercy, the German government refused to commute her sentence, and she was shot. The execution received worldwide condemnation and extensive press coverage.

The German occupation of Belgium of World War I was a military occupation of Belgium by the forces of the German Empire between 1914 and 1918. Beginning in August 1914 with the invasion of neutral Belgium, the country was almost completely overrun by German troops before the winter of the same year as the Allied forces withdrew westwards. The Belgian government went into exile, while King Albert I and the Belgian Army continued to fight on a section of the Western Front. Under the German military, Belgium was divided into three separate administrative zones. The majority of the country fell within the General Government, a formal occupation administration ruled by a German general, while the others, closer to the front line, came under more repressive direct military rule.