prison camp
internment camp
prisoner of war camp
POW camp

He spent the final month of the war in a POW camp.

He spent the rest of the war in a POW camp.

It was his back pay for the time he'd been in the POW camp.

He was shot down and sent to a POW camp.

As things were, he'd sit out the rest of the war in a POW camp.

Well, the school with its rules sounds like a POW camp.

Surely it couldn't be a POW camp, not after all these years.

They told me there were traces of my father's time in a POW camp here.

The story was believed, and all were sent to an ordinary POW camp.

They became items for trade, like cigarettes in a POW camp.