<name>, the struggle continues. Lucky for us, we're stocked up on bombs and rockets! Time for another bombing mission -- this one's a long one, through the Bombardment and into the Valley of Lost Hope. Head back out with an infra-green bomber and blow those Scourge into little scourge-lets!
Great work, <name>. While you were out, I heard other gunners talking about you... I think you have a real future in air offense!
Focus on the ground troops on the first part, then switch to anti-air to fight off any gargoyles that you've managed to aggro. When the ground troops are starting to get thinner, go to anti-air to kill frost wyrms. When you're almost done with frost wyrms, focus on the war machines on the ground, which shouldn't be hard to do. Always keep your shield above 70 charges and put out the fire in repair mode.