The war who ended all wars in the West at least

 I saw some historical recreation of medieval battle.

The battles were real, real knights versus real knights fighting with blunted weapons. Men and women sweating under heavy armour, suffocated by their helmets, while taking blows from all sides.

What a difference with  experiences from WW1 described in Owen Wilfred poetry Dulce et decorum est: https://youtu.be/qB4cdRgIcB8 

In preindustrial wars, one cover himself glory either by defeating enemies, either by bravely dying.

WW1 on western front took away this. The only thing you could be covered was mud.

Soldiers survival depended more on whims of artillery gods, than their personal skills. Also the victory depended more on power of industry than their skills 

So the idea that the war is a chance for the warrior to prove himself was over.