The reason I ask is because of the large heavy gun vehicles that Yoda uses to shoot down the Trade Federation core ship. The more I look at them, the more they look like the South African army's self-propelled 155-mm artillary piece. Are they meant to be artillary weapons? If so, how do they fire at targets out of line of sight?
I recall that, at the beginning of 'Terminator 2', you see the large battle from Gen. Connor's point of view, and several of the plasma bursts are seen going ballistic, curving over and coming down after being fired into the air. It seems odd to imagine an energy or particle stream being affected by gravity, but can it be done? The best idea I can come up with is having charged particles as your weapon discharge. Then fire them through an electromagnetic solenoid, adding a slight 'curve' to the particles' trajectory so that they come down BVR. I'm not sure if that would actually work though.

Thoughts/comments/criticism?