"Are you sure we can't be seen?" Rose looked across what should have been rolling hills of grassland. Instead, there was a churned landscape of mud, littered with bodies and the detritus of war. The wind swung around, bringing with it the smell of blood and death, and the groans of the dying.
Rose shivered and the Doctor took her hand. "It's a simulacra of the futility of war. The people wanted to remind their descendents of the price paid in blood. To make them find another way."