We Are the 5th Wave

"I was looking at the stars again, just thinking. Thinking if Evan is still alive. If he ever made it out alive. Or maybe that last touch of his lips were his goodbye. When he told us to go, in my mind I was panicking. Freaking out. Wanting to just see I'm again. I turned and faced Sammy. She looked so cute while he slept. But I know he must dying on the inside. He's only 7. But yet we lost our parents, and I'm all he has left."

What would happen to the group and Cassie if they fought back against The Others?