World War I: Start of the Battle of Lorraine, an unsuccessful French offensive.

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.

The Battle of Lorraine was a battle on the Western Front during the First World War. The armies of France and Germany had completed their mobilisation, the French with Plan XVII, to conduct an offensive through Lorraine and Alsace into Germany and the Germans with Aufmarsch II West, for an offensive in the north through Luxembourg and Belgium into France, supplemented with attacks in the south to prevent the French from transferring troops to the greater threat in the north.

August 14 is the 226th day of the year in the Gregorian calendar; 139 days remain until the end of the year.