I'd like to show you how artillery works but although I have some friends at Fort Sill (Oklahoma) I don't know anyone at Drum anymore. (Fort Drum is the only army post east of the Mississippi with a range capable of handling anything larger than the 105mm.) For reasons I don't understand the 8" has been retired but the 155mm is pretty good. Besides, the 8" needs a 20-man crew to service it. I have a model of the 8" that is quite detailed. It's been more than 40 years since the last time I fired an 8" but I am always surprised at how much I remember about it. I guess there are some things you don't forget.
As long as you are within range you can put more iron on target, faster and cheaper with field artillery than any other method. If you need a big bang you run a TOT (Time-On-Target) mission. This is where the guns are fired so that the impact is identical. A battalion TOT is VERY impressive and during WWII as many as 40 battalions fired - that's more than 900 rounds of high explosive in one big bang within less than 100 yards. Air bursts would put a shell fragment about every 6".