Jim, I get that you really like guineas, and it's nice that yours get along with the other poultry.
Mine got along well too -- until one day they didn't.
The OP has not had just one incident, but a series of attacks.
My guineas started by attacking my buff Orps, and escalated/generalized from...
Shellie, you make me laugh, because I saw your post about selling these beasts, and then I see this one here.
I'm right there with ya, sister!
Have seven miserable 18 week-old guineas that started torturing my pullets, and are now living in guinea prison. I have only two hens and five cock...