To find out more about Gideon - he was a Judge over Israel for over 40 years look up the following:
Judges Chapter 6.7-23: Gideon is called by God - notice the humour in the angel's greeting, also that God calls Gideon three times and he asks for proof that it is God calling him.
Judges Chapter 7.9-23: How Gideon defeats the Midianites and their supporters.