First World War: British mariner Charles Fryatt was executed in Bruges, Belgium, after a German court-martial found him guilty of being a franc-tireur.

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.

Charles Algernon Fryatt was a British merchant seaman who was court martialled by the Imperial German Navy for attempting to ram a German U-boat in 1915. When his ship, the SS Brussels, was captured by the Germans off occupied Belgium in 1916, Captain Fryatt was court-martialled under German military law and sentenced to death for "illegal civilian warfare". He was executed by firing squad near Bruges, Belgium. In 1919, his body was reburied with honours in the United Kingdom.

Bruges is the capital and largest city of the province of West Flanders, in the Flemish Region of Belgium. It is in the northwest of the country, and is the sixth most populous city in the country.

A court-martial is a military court or a trial conducted in such a court. A court-martial is empowered to determine the guilt of members of the armed forces subject to military law, and, if the defendant is found guilty, to decide upon punishment. In addition, courts-martial may be used to try prisoners of war for war crimes. The Geneva Conventions require that POWs who are on trial for war crimes be subject to the same procedures as would be the holding military's own forces. Finally, courts-martial can be convened for other purposes, such as dealing with violations of martial law, and can involve civilian defendants.