Ink has it right. Fly against the horde. Last night rooks were were hording A9.
It was a strange scenario. I played there for a couple of hours, and saw just one, that I remember, of each of the following: ki84, nik, spit, p38, F4U. It was almost all 51's and D9's. You had to be a little patient, but you could catch one in a mistake now and then. I bagged about 20 hordelings without losing a ship. Mmmm hordelings.