A hard rain

I'm learning this, having half-known it for over 50 years. Quite tricky to learn as it's almost a series of lists. But it's the only thing I feel like singing at the moment.

"What did you see, my blue-eyed son......
.........
I saw guns and sharp swords in the hands of young children..."

BD wrote that in 1963 - fair puts the chills up my spine.