Remembrance or "Poppy Day" is Great Britain's day of remembrance for its WWI veterans. The practice of wearing poppies takes its origin from the poem, “In Flanders Fields, 1915” written by Lieut. Col. John McCrae. He was a member of the first Canada contingent and died in France in 1918 after four years of service on the western front.
"Empty shell casings and ammunition boxes representing a small sample of the ammunition used by the British Army in the bombardment of Fricourt, France, on the first day of the Battle of the Somme, 1 July 1916." Australian War Memorial.