How do you simulate artillery barrages?

[stg58fal]

I'm going to go out on a limb here and assume you'd like your players to survive the ordeal.

Description, mostly. Sure, roll some dice so they think they're in danger, have some fragments tear through the canvas or body of any soft-skinned vehicles they're driving and whiz past someone's head. If they're on foot, have some trees take hits overhead and shower them with splinters. That kind of thing.