Gibraltar, Elizabeth II (1952–2022). 1/2 Crown 2018, Centennial of the End of World War I - At the going down of the sun

In Flanders Fields (Polish: Na polach Flandrii or Wśród pól Flandrii) - a poem by the Canadian poet, physician, and World War I soldier John McCrae. It was inspired by the death of the poet’s friend, Alexis Helmer, during the Second Battle of Ypres. The poem was written on May 3, 1915, and was first published in the magazine Punch on December 8, 1915.
The poem tells of red poppies that bloomed in abundance on the graves of soldiers who fell in battle. The association of poppies as a symbol of the fallen was subsequently adopted in Anglo-Saxon countries. Poppies are worn pinned to clothing or attached to car radiator grilles. The red poppy has become the primary symbol of Remembrance Day, observed on November 11. A quote from the poem also appears on the Canadian twenty-dollar bill.
The title of the poem is referenced in the name of the museum in Ypres dedicated to the history of World War I on the Western Front in West Flanders - the In Flanders Fields Museum.
source: wikipedia.org

The phrase - at the going down of the sun - symbolizes a solemn commitment to commemorate and honor fallen soldiers and the victims of war at any time of day.
This line comes from the fourth stanza of the poem For the Fallen - the Ode of Remembrance - written by the English poet Laurence Binyon in September 1914 during World War I.