bly　in　a　somewhat　open　spot；　Cao　Cao　suddenly　looked　up　and　began　to　laugh　loud　and　long。

His　panions；　remembering　the　sequel　of　his　last　laugh；　said；　〃Not　long　since；　Sir；　you　laughed　at　Zhou　Yu　and　Zhuge　Liang。　That　resulted　in　the　arrival　of　Zhao　Yun　and　great　loss　of　troops　to　us。　Why　do　you　now　laugh？〃

〃I　am　laughing　again　at　the　ignorance　of　the　same　two　men。　If　I　were　in　their　place；　and　conducting　their　campaign；　I　should　have　had　an　ambush　here；　just　to　meet　us　when　we　were　tired　out。　Then；　even　if　we　escaped　with　our　lives；　we　should　suffer　very　severely。　They　did　not　see　this；　and　therefore　I　am　laughing　at　them。〃

Even　at　that　moment　behind　them　rose　a　great　yell。　Thoroughly　startled；　Cao　Cao　threw　aside　his　breastplate　and　leaped　upon　his　horse。　Most　of　the　soldiers　failed　to　catch　theirs；　and　then　fires　sprang　up　on　every　side　and　filled　the　mouth　of　the　valley。　A　force　was　arrayed　before　them　and　at　the　head　was　the　man　of　ancient　Yan；　Zhang　Fei；　sea