I'll be posting later due to an invasion in my back yard which is in need of repelling.
UPDATE: Counter-offensive successful; it was just a tiny nest. They dropped like--dead hornets.
I had been outside hanging up clothes (a new dryer is in the offing), when three huge hornets--buzzing like B-52s--nearly took my head off as they headed for their new home--an old bulb-less lantern hanging underneath the patio enclosure. From the top of the lantern hung a small, whitish structure that appeared to be made of small pebbles. Over it, about ten hornets were having a house-warming party.
I've been stung by a wasp/hornet before and did not have a noticeable anaphylactic reaction. However, I'm afraid that the next time I might not be so lucky and, since then, I've been doing everything I can to keep that second sting from happening. Hope hornets don't believe in blood-feuds.