Granny said that the Germans
dropped incendiaries on the fields
outside her house,
she was very upset
.
Grandad said he'd get his gun and
show the *** what for

I think what for was a metaphor.

Gran was easy going
never having been anywhere
except to do the shopping
and pop into the bookies
for a bet,
Grandad was a gruff man
he'd been a
Major sort of miner
digging coal out of
the pit

and I think what for and why
did the fires fall down from the sky
but
I wasn't even born then,
when only few remember.