Is there a no retreat mod for Total War Shogun 2?

I usually use the custom battles thing, but I do get annoyed about how fast the battle ends when some of the enemy troops start to retreat shortly after their general dies. Mind you there are some times they stay longer, but not that long. And most of them retreat with 200 out of 250 troops left in their platoon, which is just annoying. So, I'm just curious if anyone made a mod that stops the retreating, I quite enjoy the sound of my troops firing their muskets (I know they are called something else in this game, it's just easier to call them that, lol) but I hate when they can only get off one or two rounds before retreating. Thanks in advance.