Keep holy watch with silence, prayer, and fasting
Till morning break, and all the bugles play;
Unto the One aware from everlasting
Dear are the winners: thou art more than they.

Forth from this peace on manhood's way thou goest,
Flushed with resolve, and radiant in mail;
Blessing supreme for men unborn thou sowest,
O knight elect! O soul ordained to fail!

Louise Imogen Guiney

http://www.poemhunter.com/poem/the-vigil-at-arms/