Phalanx!
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Didn’t work shells to big, gun action set for fast moving targets not slow ones.
Suggested in article comments is mini-cannon using .30 cal rounds instead, as well as some sort of weapon firing shot gun-like round (WWII naval AA gun?).
Minigun. Me likely. I had a t-shirt years ago with a picture of one with “GE. WE BRING GOOD THINGS TO LIFE!” under the pic.