Liang　at　your　feet。〃

Cao　Cao　gave　them　generous　gifts。　Soon　after　the　two　men；　each　with　his　five　hundred　soldiers；　set　sail　with　a　fair　wind　for　the　opposite　bank。

Now　as　Zhou　Yu　was　preparing　for　the　attack；　the　arrival　of　some　northern　ships　was　announced。　They　bore　the　two　younger　brothers　of　Cai　Mao；　who　had　e　as　deserters。

They　were　led　in　and；　bowing　before　the　general；　said；　weeping；　〃Our　innocent　brother　has　been　put　to　death；　and　we　desire　vengeance。　So　we　have　e　to　offer　allegiance　to　you。　We　pray　you　appoint　us　to　the　vanguard。〃

Zhou　Yu　appeared　very　pleased　and　made　them　presents。　Then　he　ordered　them　to　join　Gan　Ning　in　leading　the　van。　They　thanked　him　and　regarded　their　scheme　as　already　a　success。

But　Zhou　Yu　gave　Gan　Ning　secret　orders；　saying；　〃They　have　e　without　their　families；　and　so　I　know　their　desertion　is　only　pretense。　They　have　been　sent　as　spies；　and　I　am　going　to　meet　their　ruse　with　one　of　my　own。　They　shall　have　some　information　to　send。　You　will　treat　them　well；　but　keep　a　careful　guard　over　them。　On　the　day　our　soldiers　start　the　offense；　they　shall　be　sacrificed　to　the　flag。　But　be　very　careful　that　nothing　goes　wrong。〃

Gan　Ning　went　away。

Then　Lu　Su　came　to　tell　Zhou　Yu；　saying；　〃Everyone　agrees　in　thinking　the　surrender　of　Cai　Zhong　and　Cai　He　feigned　and　they　should　be　rejected。〃

〃But　they　wish　to　revenge　the　death　of　their　brother；〃　said　the　General。　〃Where　is　the　pretense？　If　you　are　so　suspicious；　you　will　receive　nobody　at　all。〃

Lu　Su　left　much　piqued　and　went　to　see　Zhuge　Liang　to　whom　he　told　the　story。　Zhuge　Liang　only　smiled。

〃Why　do　you　smile？〃　said　Lu　Su。

〃I　smile　at　your　simplicity。　The　General　is　playing　a　game。　Spies　cannot　easily　e　and　go；　so