Quote Originally Posted by nederlander View Post
I have seen it but the opposite too, fire at will on and them not firing at all, just loading their guns standing there...
It's possible you manually gave them a target they can't see/fire at. I noticed that sometimes my fixed arty would just stand there like idiots during a city battle after I ordered them to blast a building to smithereens (don't you love infantry garrisoning buildings ? It's like a yummy arty piñata !). Turns out, there was no direct line of fire. I had to blow up a few other buildings that were in the way, then they were able to shell the intended target.

The LOS is sort of picky, too. It seems to be calculated from the center of the formation, so sometimes one piece will have a clear LOS but won't fire because the target is masked from one or two cannon. And this is one more reason fixed arty sucks :)