Armistice Day announced the end of the First World War at 11 am on 11 November 1918.
From 1919 until 1945, Armistice Day observance was always on 11 November itself.
It was then moved to Remembrance Sunday, the second Sunday in November being the closest to 11 November.
The creation of the Royal British Legion in 1921 brought together four National Organisations of ex-Service men that had established themselves after the Great War of 1914-1918.
The first ever Poppy Appeal was held that year with the first Poppy Day on 11 November 1921.