Finally did the Union arty mission in the Chimera campaign. What a slog! The Alliance arty mission only took me 2 games in the M12.
Happy I won't have to touch arty again until I start the 279 campaign.
That's the tier 8? I used the S51 because I had no Soviet arty in my garage from before, and it was cheaper to buy and research.
I'll have to get a tier 8 or up for the 279 missions though, but for now I can enjoy not playing arty.