We have all experienced a sense of dread. We may not be able to identify why we have fear and our dread is unfocused. Sometimes there are circumstances developing that makes our sense of unease well founded. Elgar's dread was well founded.
World War I was called the war to end all wars with the loss of an estimated 37-million people, but it did not end all wars. Only God knows the true numbers of lives lost to war since then and the incalculable grief of loved-ones.
I am a Christian. I believe there will come a time when God will put an end to war and wipe away every tear of the brokenhearted (See Revelation 21.3-4).
"They will beat their swords into ploughshares and their spears into pruning hooks. Nation will not take up sword against nation, nor will they train for war anymore." Isaiah 2.4.
[Link below to Edward Elgar's Sospiri, Op. 70, Cellist, Sol Gabetta or https://www.youtube.com/watch?v=886dO7OA6eY ]