Who Were The Watchers?

Q. Re your answer entitled Fallen Angels.  Who were the Watchers?  What/who did they watch?  Who assigned them that function?  What was their purpose?

A. According to the apocryphal Book of Enoch, the “watchers” are angels stationed on Earth by God to watch over the people, like sentinels. In the time before the flood, the watchers became attracted to the human women they saw, and defected to marry them and live among men. The children produced by these relationships were the Nephilim of Genesis 6:4.  They were mentioned three times in Daniel 4 by the dual name of watcher (or messenger) and holy one, and by Jude and Peter as being kept in chains for judgment.