It happens time and time again to the AI. There is a greyed out box that states "This army cannot fight in night battles", so the AI loses one of it's attacking armies.

The battles are never night battles.

Nevertheless, to try to prevent this from happening, I tried to disable the night battles in the desc_strat file, but the game crashes when I do that even at the start of a campaign.

I never really get night battles anyway, I think because I changed the weather file years ago if I remember correctly.

As for the greyed out box, a Google search told me that this was fixed in a patch way back in 2007.

So I am baffled. Any help, please?