Jep...seen this happen (alot)

And in my games it allso corrupts both attacker and defender troops.

Have you tryed using those troops you used in imaginary battle in other battles after that first one ?

My computer crashes to desktop if i use my troops from bugged battle or if i attack AI province that has been in bugged battle.

So if you have your top general in that battle its either load or new campain (as i had to do after my first one...2 weeks playtime lost).But atleast NOW i save every turn in different space.