Looking for a word that would describe, for example, a soldier who is willing to climb up out of a trench and charge to his death at the order of the commander. Or a person who, through some supernatural power, learns their fate, but attempts to push against it anyway. Or Frodo and Sam hopelessly marching alone against Mordor. Or Theoden and his entourage charging out the gate of Helm's Deep when they believe that there is no longer any hope of winning the battle.
Sort of the Finnish word Sisu but without the belief that the impossible odds can be overcome.
A kind of grave determination to at least 'give it a shot.'
Looking for a single word, preferably a noun that could be used like "The captain's speech filled him with _______" or an adjective that could be used like "Despite knowing that he would be dead before the day was out, the _________ man marched on."