He and his family have spent 13 years behind enemy lines.

But even so, we were on our own, miles from any support, behind enemy lines.

They make a final charge at the enemy lines and win the day.

It would not take long to reach the enemy line.

Into the air they go and fly behind the enemy lines.

With a little bit of luck, he could stay behind enemy lines on the ground until the war was over.

She had to think of herself as a soldier going behind enemy lines.

He sat up and looked south, the enemy lines were thirty miles away.

The feeling of being behind enemy lines was strongly with him again.

"Only the front of the enemy line can be trapped here."