The first world war is a bad example. While the war was absolutely started by royalty, they did send their sons to the front to die along with commoners.

> Although the great majority of casualties in WW1 were from the working class, the social and political elite were hit disproportionately hard by WW1. Their sons provided the junior officers whose job it was to lead the way over the top and expose themselves to the greatest danger as an example to their men.

> Some 12% of the British army's ordinary soldiers were killed during the war, compared with 17% of its officers. Eton alone lost more than 1,000 former pupils - 20% of those who served. UK wartime Prime Minister Herbert Asquith lost a son, while future Prime Minister Andrew Bonar Law lost two. Anthony Eden lost two brothers, another brother of his was terribly wounded, and an uncle was captured.

https://www.bbc.com/news/magazine-25776836

Also, Princes Oskar and Eitel Friedrich of Prussia both served in front-line combat roles and both were wounded.