Capture all 4 of the enemy command posts. Continue to hold it down so that no vehicles can get into the base. The easiest way to do this is take out your fusion cutter, run to the gate winch and hold down the R1 button to repair it.
Run up to command post 3 and defend the oil refinery for 4 minutes.
Once the timer is down to 0, press the triangle button when you are standing at command post 2, ( if you are in a TX-130, you will be able to do it when you hop out) and switch to the clone engineer. If you see someone driving a TX-130 on your way, hop in it and use it instead. Use your rocket launcher to destroy armored tank droids and spider walkers. Then, run to command post 2 and defend it for 3 minutes. First, spawn at command post 1 as a heavy trooper. Level 5 on Rise of the Empire mode: On level 5, you play on Kashyyyk, the ocean and forest world, home of the Wookiees.