Remembrance Day is observed on 11 November to recall the official end of World War I on that date in 1918, as the major hostilities of World War I were formally ended "at the 11th hour of the 11th day of the 11th month" of 1918 with the German signing of the Armistice. (Note that "at the 11th hour", refers to the passing of the 11th hour, or 11:00 am.)
The day was specifically dedicated by King George V, on 7 November 1919, to the observance of members of the armed forces who were killed during World War I. This was possibly done upon the suggestion of Edward George Honey to Wellesley Tudor Pole, who established two ceremonial periods of remembrance based on events in 1917.
The red poppy has become a familiar emblem of Remembrance Day due to the poem In Flanders Fields. These poppies bloomed across some of the worst battlefields of Flanders in World War I, their brilliant red colour an appropriate symbol for the blood spilt in the war.