Remembrance Day is observed in Commonwealth countries on November 11th to honor those who have died in wars. It commemorates the end of World War I in 1918. Poppies have become a symbol of Remembrance Day because they grew on World War I battlefields in Flanders. A famous World War I poem called "In Flanders Fields" references poppies growing among the crosses marking graves. On Remembrance Sunday in the UK, a two minute silence is observed to commemorate those lost in war.