勝敗兵家事不期,
Victory or defeat is a common result unpredicable to a fighter;
包羞忍恥是男兒。
from the disgrace and the insult in loss a real man should suffer.
江東子弟多才俊,
There are still talents and braves in your hometown over east of the river;
捲土重來未可知。
why not ferry across and make a comeback which you will never know, ever.
PS . "莫散了團體,休灰了志氣。" That is what the founder of your party taught you in his will. But please keep this in your mind: your name is The Nationalist Party of "China", even after you betrayed the party line and mounted a coup of 412 Incident in 1927.