:: VIDEO WARNING - Contains scenes of emergency surgery and pictures of severely wounded adults and children.
The town of Zawiyah, just 30 miles from Libyan capital Tripoli, has witnessed some of the heaviest fighting in the escalating crisis.
They fought tooth and nail here. They had few weapons against the military firepower of Colonel Muammar Gaddafi's Khamis Brigade but somehow, against overwhelming odds, they fought them off over and over again.
Col Gaddafi's regime is slowly trying to pound and starve these people into submission. But they just refuse to give up.
On man said: "They are killing us by the snipers. We are the resistance here and we are staying until the liberation of the whole of Libya - from the sea to the desert."
Later, Sky News watched Col Gaddafi's military machine moving into action against them.
The rebels in Martyr Square were taking another hammering.
It is not long before the casualties start arriving again at the main hospital, where even the medical staff have come under fire.
As the stretchers are wheeled in, Sky saw one man, incredibly still conscious with an unexploded anti-tank grenade in his thigh.
The wards are filled with civilians - university professors, doctors, engineers.
A surgeon told Sky: "This is a student. He was shot under a bridge. Most of those shot have chest, neck and head injuries.
"They are not shooting to maim or to frighten. If you want to frighten, you shoot into the air."
One 10-year-old boy told the doctors he was sitting on his doorstep playing when he was hit several times.
Suddenly, there is shouting and cheering as hospital staff witnessed the sight of a retreating army.
The regime's military vehicles are moving again - out of Zawiyah, back to Tripoli.
They will probably be back - and the town that will not be broken will be waiting for them.