ROBOT INVASION (for Daley) see description

Robots have begun the invasion on Earth plastic and a enemy warship has split off from the main invasion force to secretly attack a military base. But luckily we have located this warship and you are to be sent to a beach west of the base to stop this attack. The Robots have much better technology than us so do not underestimate them. Good luck Sarge! Challenge: Try beating the invasion without building any spawners (Plastic factories not included). I hope you enjoy this map :)