The warrior may fight for gold or for an immediate gain or for something to take home for the winter to feed the family. The soldier is part of a more complex society. He's fighting for a group ethic of some sort.
My ace in the hole as a human being used to be my capacity for remembering birthdays. I worked at it. Whenever I made a new friend I made a point of finding out his or her birthday early on and I would record it in my Filofax calendar.