Thanks for the input everybody! I agree with everything that has been said. I think a big part of the problem I had was making all the enemy tank an instance from the same object, (I cant remember exactly why) but this made it difficult to control the tanks effectively. The tank movement was just the car behaviour, and I agree it did not particulary work as well writing my own control statements. I know i am probably the only one on this site who does not know how to do this, but how do you post screen shots on this site?