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Sorry to hear that.
Must be tough for the cats too.
They must be very hungry to have migrated 4 miles to your place.
Are they friendly or feral ?
Don't suppose you could trap and transport the cats to your local animal shelter ?
They will be easy to trap since they are so hungry.
Or feed them, tame them a little and then advertise them as "barn cats needing a job" in your local paper ?
I trap, neuter, vaccinate, test for FIV, etc and find new homes for the cats that wander in from the trailer park 2 miles up the road. Gets a bit busy around June.
Just some ideas. Anyone got any other workable thoughts, without mentioning the obvious ?