I don't think i've had more than a couple battles where arty really saved the day, and those battles had tons of arty.

1. So I'm Prussia in India (inorite?) and I've just taken one of the Maratha provinces 2 provinces west of Bengal. So, my main army is marching on Bengal (with my Mughal allies) and I leave the town before relatively unguarded (2-3 company infantry, 4 howitzers, 2 mortars) just to keep the populace under control. Well, the Marathas don't like me being so cocky apparently.

So, with overly spammed cavalry, and some very, very elite infantry (using the AUM mod) they come to attack me from 2 sides. My Howitzers, once calibrated right, started kicking some ass as enemy infantry fell, marching perpendicular to me, along a road ready to turn at me. The cavalry was taken out relatively (and astonishingly) quickly, but then the damned dervishes and hindu swordsmen came. I barely survived that. Thier cavalry is regrouped, now i'm totaly screwed. So, I bear all arty on them, and oddly enough, rout them. then there is just 2 units of foot arty left. They then proceeded to rout all 3 of my line inf, and were too close to hit with my arty as the final cav charge began. I lost, but it was easy taking it back with so few defenders.

2. Another battle against the Marathas. This time, I have a full army (with elite Swiss Guards from the AUM mod) with like 6-8 arty (about half howitzers, half horse arty) against a full stack of Marathas (unsurprisingly spamming cavalry and elephants). My line is set up with my main elite infantry in a line about 4 men deep, my Cavalry on the left flank, and my arty + another line inf(maybe swiss guard, not sure) in a line to the side, aimed toward where the enemy will be crossing the fields.

So the main enemy advance comes. Lots and lots of Shrapnel shot is raining down on these guys, and elephants are dropping like flies. A couple bargirs advance through some trees to attack my arty, which is promptly stopped by my guards. While that is happening, about 3 units of Bargirs decide to attack my arty head-on. they got annhilated by the canister shot.

I probably could have beat them without so much arty, but with much more casualties than I recieved. the crossfire with the bargirs ripped my arty crews apaart though.