Assuming the ground defenses only fire at craft coming down, and not those leaving.

The ground defenses would need quick reactions to intercept them, but they were prepared for the attack.

But only the ground defenses remained to offer protection to the citizens of Prairie.

He tried to remember what its ground defenses were like.

But the ground defenses were making their final inspired effort to slow the hurtling mass of death.

"There had to be some better way, is all I'm saying, something less savage than a ground defense."

Planets are taken by eliminating all ground defenses on an enemy world.

Without that pressure from the north, Iraqi forces could focus their ground defenses on the south and west, planners said.

The ground defenses were still resisting strongly when he pulled out.

And then let us all hope Valentine hasn't also invested in some ground defenses.