World War I: The German minelayer SS Königin Luise lays a minefield about 40 miles (64 km) off the Thames Estuary (Lowestoft). She is intercepted and sunk by the British light-cruiser HMS Amphion.

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.

A minelayer is any warship, submarine, military aircraft or land vehicle deploying explosive mines. Since World War I the term "minelayer" refers specifically to a naval ship used for deploying naval mines. "Mine planting" was the term for installing controlled mines at predetermined positions in connection with coastal fortifications or harbor approaches that would be detonated by shore control when a ship was fixed as being within the mine's effective range.

SS Königin Luise was a German steam ferry. She operated between Hamburg and the Netherlands, before being taken over by the Kaiserliche Marine on the outbreak of the First World War. She was used as an auxiliary minelayer before being sunk on 5 August 1914.

The Thames Estuary is where the River Thames meets the waters of the North Sea, in the south-east of Great Britain.