Quintus Curtius said:
To me it's the height of chivalry to be able to treat an enemy at arms with respect. There are many examples of this in history...such as the relationship between Saladin and Richard the Lionhearted.
But in the modern age, it's sadly rare. One has a hard time imagining world leaders today treating their enemies with respect. But I think it does exist on the battlefield, in one form or another, in some situations.
My knowledge isn't superb but I believe there was more honor in war prior to the industrial revolution.
In a way I've heard "war" actually filled a void which modern professional sports do, it wasn't just about "killing the enemy" but a competative and bonding experience as well.
After the industrialization of war and the eventual invention of machinery such as drones, missiles, nuclear weapons, etc the soul got sucked out of war and it became simply about maximizing killing efficiency. I believe WWI and WWII played a big role in this when nations saw how much destructive power they could harness with technology.
I honestly see technology as having done more harm than good to societies in a lot of ways, and it's probably one of the biggest threats to masculinity really.
This is one of the reasons why we see a rise in "beta males" in industrialized nations, since men no longer have to hunt, have to fight, have to have male bonding - office jobs, fast food, automated transportation, video games, etc end up replacing traditional outlets for masculinity, androgenyzing the gender roles as a result.