It all depends on who you are and where you come from. Has at least one of the 600 guys never thought about giving up and joining the other side? I mean, the valley of death, it's quite salty.
This is why courage is tricky. Should you always do what others tell you to do? Sometimes you don't even know why you want to do something. I mean, any fool has courage.
But honor, that's the real reason why you either do something or not. This is who you want to be. If you die for something important, then you have both honesty and courage, which is good. I think this is what the author wants to say. You should try the hope of courage and honor. There are even some people who pray to tell you what to do.