You know, when I grew up reading those romances, I've always wondered this: what was the point of bringing all those soldiers with you if the battle was going to be decided by 1-on-1 duels between generals?
Another funny literary trope was the 免战牌. It was essentially a unilateral declaration of cease-fire, and somehow the opposing army would automatically respect it!
oh, yes that thing! The general is injured or sick, or had a bad dream last night, so a 免战牌 hangs on the wall; the opposing army saw it, and goes "Awww.... no fighting today?" and all just grudgingly go back to their own camp, with heads held low.
Also mythical and unrealistic was the romantic depiction of the military formations, such as the Ba-Gua formation. I do admit, however, that this is more of an issue with TV and movies, which however did convey an entirely false image of what actual formations of such look like or are for.
Ba-Gua formation (which is a mentioned name in ancient military manuals) is not a static Ba-Gua looking maze made of men. And they certainly do not act to defeat the enemy by making them running around inside like headless chickens inside the maze, because for one thing, enemies do not just run into gaps in your formations in narrow files with lots and lots of flags like Olympics opening ceremonies.