Dictionary of Greek and Roman Biography and Mythology/Herennius 14.

14. Herennius, a young man of profligate habits, whom Augustus expelled from the army. When the order was issued, he asked, " How shall I present myself at home? What can I say to my father? " " Tell him," replied Augustus, " that you did not like me." Herennius had been scarred on the forehead by a stone, and boasted of it as an honourable wound. But Augustus counselled him : " Herennius, next time you run away, do not look behind you." (Macrob. Sat. ii. 4.)