Rudyard Kipling, often seen as jingoistic poet, persuaded his only son to volunteer for the First World War, where he was killed six weeks after his 18th birthday at the Battle of Loos in 1915. His body was never found. Kipling’s Epitaphs of War, written in 1919, includes:
If any question why we died,
Tell them, because our fathers lied.
The rest are at: http://www.kiplingsociety.co.uk/poems_epitaphs.htm
Kipling served on the War Graves Commission and helped ensure all the other sons bodies that could be found were buried and remembered along with the unknown soldiers too…