I’m just reminding you what people used to believe back in the day when there were still gentlemen in the world. And yes they did fight face to face. They were more brave than you can imagine.
You may not know much about history if you don’t know that submarine attacks used to be considered contemptible. British General Arthur”Bomber” Harris was shunned by many of his peers after wwii.
There might be fewer wars in this world if they required the older kind of courage and skill, instead of just pushing a button.
I’ve studied history my entire life. My degree is in History. Your ubiquitous historical “gentleman” is largely a myth, and at best is anecdotal, restricted to a miniscule number of examples, an exception rather than the rule. It makes for good literature, but poor reality.