"The Immortal Legions" is a poem written by Alfred Noyes, and set to music by the English composer Edward Elgar.
[1][2] The poem is of quiet grief and thanksgiving in remembrance of those who died in the achievement of victory.
The song starts after a short introduction, pensively, in a minor key, with the solo voice which is joined by a simple ostinato-like bass line.
The gentle middle section seems to show the sentiment of hope.
The song ends triumphally in the relative major key, with words of thanksgiving.