Lord of the Flies

We are being invaded by flies. I have not a clue where they came from but they are covering the kitchen windows. I have spent that last 1/2 hour with flyswatter in hand, going to battle with these annoying flying insects. I am about ready to scream. I also had to clean up the ones that where killed in the battle and tossed their squashed little fly bodies in the trash. Hopefully the others seen what happened to their peers and will leave quietly the way they came in.