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Many of those fighting pro-Gaddafi forces on the frontline are volunteers.

They are teachers, engineers and students, with little military training, and they have to learn about combat while engaging in it.

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. But only one came back alive.

Source: Al Jazeera