How did the Germans treat allied POWs who where Jewish?

Ummm Nazis and Jews? The Nazi POW camps were horrible to begin with many allied soldiers dying in custody. If they discovered you were a Jew it was game over. Soldiers would go out of there way to hide it and were shielded by fellow soldiers. Usually if they discovered you were jewish they would seperate you from the rest of the soldiers and act on it. It all depends of who the German commander was too. Rommel was known for his kindness to Jews and POWs