World War I: The Fifth Battle of Ypres begins.

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 Fifth Battle of Ypres, also called the Advance in Flanders and the Battle of the Peaks of Flanders is an informal name used to identify a series of World War I battles in northern France and southern Belgium (Flanders) from late September to October 1918.

September 28 is the 271st day of the year in the Gregorian calendar; 94 days remain until the end of the year.