Many “Warriors” sacked cities, carried off women as slaves, burned down villages and did other things we would consider reprehensible today. While I of all people value the “Warrior Ethic”, as we have re-codified it with our modern values; I would hesitate to define the basic concept of a “Warrior” as necessarily “virtuous”, at least by any modern standard. Remember though that was the “Way of War” in those days. Warriors were warriors because that’s what they were. Most were born into a caste system, Knights, Samurai, Tribal Warriors etc….Soldiers were the “Average Joe’s” that joined (or were conscripted) into armies, taught how to fight, paid in some manner and sent into battle. Many went back to being “Joe Farmer” afterwards. Some became “Career Men” and sort of crossed the Soldier/Warrior boundary. In our times I would say that the difference between a Warrior and a Soldier is a matter of professionalism, commitment to craft, and the honoring of a “code” either personal or codified. In the military, when you meet a “Soldier” vs. a “Warrior” you know it….
I don’t really now of any example in military history where significant things were accomplished by warriors who “fought alone”. The lone wolf, Rambo “Warrior” is a myth IMHO. Even the Samurai and medieval Knights who were of the “Warrior Class” fought in organized battles. Examples of individual combat did absolutely exist, but all warfare is typified by some form of teamwork. Our modern definition of “Warrior” is very different from the historical model IMO. For example, the Samurai were “Warriors” by caste and at the same time there were Ashigaru “Soldiers” recruited from the other classes who fought at the same time. They all fought, bled and died pretty much the same, but what was expected of the Warriors by their society was quite different. There really is no “class” difference in the military these days (besides the officer/enlisted split), so the difference between a Warrior and a Soldier has picked up all of this philosophical/spiritual/mystical stuff. I just think of the difference as one of “dedication to craft”. The difference between somebody who “does something” from someone who “is something”.