On a hot Sunday afternoon exactly 80 years ago on Tuesday, an amplified British voice echoed across the expanse of the Bergen-Belsen concentration camp. Across the piles of emaciated bodies and the stench of death, the disembodied voice repeated: “Hello ... Hello ... You are free. We are British soldiers here to free you ...” For the countless prisoners delirious from typhus and near death, it might have been the voice of an angel. Many didn’t live long enough for the liberation; at least 14,000 died soon after. Today, among the silver birch trees at the memorial, massive heather-covered mounds...