How to complete mission 3-34?

You should be able to clear the initial armies and rescue Erupter, after that don't go too far away from him. Make sure your bunkered infantry face the oncoming armies from the west and then the east. Don't let them get the Valerie.

Try using 2 bunkers units along with 3 units of H tanks that helped me out to defeat and save our friend, as stated bunker west than east