          Sentence 1: In the course of a long night, two Black Hawk  helicopters were shot down, 73 Americans were wounded,  18 were killed, and the world’s television screens showed  images of an American corpse: dragged through the  streets by exultant Somalis.          Sentence 2: It wasn't diveilged until years later that the US  military had suffered sérious losses on that night in  Somalia. 5