Many of those fighting pro-Gaddafi forces on the frontline are volunteers.<br /><br />They are teachers, engineers and students, and they get little training and have to learn about combat while engaging in it. <br /><br />From the eastern city of Benghazi, Al Jazeera's Mike Hanna reports on twin brothers who went to the frontline under the command of an airline pilot.<br /><br />But only one came back alive.
