Exactly that mood, though in a smaller scale. I'd do a better job narrating lieutenants instead of generals, so there are smaller numbers on our screens. Perhaps a band of ~40 mounted knights under your command, it has a degree of importance and we avoid having hundreds of meaningless npcs dying in the background.

A ranger would be mandatory as the PCs will often want to scout ahead of the troops. Maybe limit the party to only one spellcaster, to give a low-fantasy military focused mood? Explore the moral dilemmas of using magic as a weapon of war?