I created a senario called PBT(Pure Bombardment Test), which I set up a town with a German panzer battalion as the defender. I chosed 20 bomber-fighter and 30 arty spotters from 105mm to 8 inch for Allied side. The scenario was 25 turns, but after 10 turns, German's moral was below 15% and surrendered. Well, actually there weren't much left to surrender anyway. The town was almost flated, and most of the German solders were killed. You know what, the scene was so real, I actually got shell shock myself, cos I was most of time watching from the German sidein see how merciless the bombardment was! I heard the sound of 8" shell flying and landing, and saw the houses being blown into pieces, solders were crying and dying, tanks and vehicles were burning! What the hell!!! Now I think I understand better why solders lost their mind when under the arty or air raid, cos you couldn't help it!! If you don't know what I am saying, do try it youself!
I also tried 300mm rickets on Allied side, they killed all Allied solders within 20 mints!! Oh God!! Just a pure hell!!!!