Suit yourselves, but I have to register a slight distaste for calculations of personal safety running in the mind of a knight. No knight should ever flinch from single combat, whatever the foe. The orders, on the other hand, are a little more persuasive, but a medieval mindset delighted in displays of individual valour from which we would receive ample forgiveness of our brashness.
This whole battle has a sordid air to it, to be honest. We have run to bay a mere pack of weary starved beggars, without horse and armour, polearms, nor even good missile troops. The enemy was noticeably less than ten thousand. If the size of the combined forces of the other Dukes so little as equals our own Duke's, then we have at least seven thousand. This battle has a foregone conclusion. There's no boast to be gained in the butchery about to be done.
While certain points of the story should factor reasonable concerns of safety into the choices made, a story also lives and breathes the interesting and challenging things being attempted. We could return to plowing a field, never seeing another battle, and be even safer than the safest place in the current battle. Yet try to write the update that describes the growing of crops with compelling vividness. I'm saying a duel is simply a better choice stylistically.