Percy gets a letter from his old friend, Jack Elliott, and you can guess the response from the Episode title! Here is a bit of what Percy wrote back:

"Jack, if you've got any manhood left in you, cut adrift from that miserable soulless lot of cowards and come over here and do your duty as a man and a true Australian, and as a Christian."

Take that Jack!

Percy finishes his officer training and prepares to go back to France.