Air and ground: Gaddafi, rebels each claim control

Muammar Gaddafi's warplanes, artillery and mortar shells can control huge swaths of territory by day, including oil ports, rebel supply routes and even hostile towns. Rebels say anti-government forces can still return in darkness to take advantage of Gaddafi's own thin supply lines and overstretched ground troops.

The eastern port city of Brega has gone back and forth with the setting of the sun in recent days and is key to the battle for Libya's oil centers - so key that both sides claimed control of it nearly simultaneously on Monday. The regime offensive appears to be hampered by a lack of manpower: They can drive out rebels with barrages, but not necessarily hold the territory. (AP)