The first mode of attack (by my husband) was to try wasp spray. He headed out in the evening, with me as back up (just in case they swarmed him, then I could spray them all, though I don't know which would be worse, wasp stings or being sprayed with a can of wasp spray.) It hit the edge, he yelled RUN, turned and we ran back to the house. Next morning, lots of activity.
My home made trap (from an internet suggestion) has gotten two of them. It is apple cider vinegar (organic no less, sugar and soap).
They are right across from our decks, one of which is where I grill, often after dark, in front of a French glass door, with a light on by the grill. They are attracted to a light. So here is the conflict. They are good for gardens and eradicating grasshoppers (which I do not like with a passion), and one site called them gentle giants. Sometimes too much information is not a good thing.