In our game two weeks ago (with Fuseboy and a few others) we came up with an interesting way of dealing with artillery, based on a DW AP I read, where a town was detailed, and then flame markers scattered over it.

Since in The Regiment, you're always drawing maps, when the German howitzers and nebelwerfers started ranging in on us, our GM started tossing poker chips onto the map.  Anything that one landed on was hit.  We were holed up in a pretty little French town, and watching the shells land and tear the shit out of all the beautiful cottages and houses we had cleared was... compelling. 

It's not right for every situation, but it worked for us. 

Especially when they scored a direct hit on the house we had set up as an aid centre for our NPC wounded.