From Halopedia, the Halo wiki
Topography and ecology
Camber has vast blue oceans and large, sprawling continents. One of the largest continents features a massive desert or plains biome, with greener environments closer to the eastern coast. Camber presumably has breathable air and comfortable gravity for humans.
Camber was a major manufacturing center for UNSC Navy fleet materials. As such, it held critical importance to the UNSC war effort and maintained its own grid of orbital defense platforms, as well as a formidable defensive fleet that included Marathon-class heavy cruisers and Paris-class heavy frigates. In one of the planet's cities, the UNSC had a key system headquarters where the 3rd Battalion Reserves were stationed.
At some point during the Human-Covenant War, Camber's location was discovered by the Covenant, sending Thel 'Vadamee's Fleet of Particular Justice to cleanse the planet of its human inhabitants. 'Vadamee and his fleet caught UNSC forces completely unprepared, penetrating the defensive fleet's early warning perimeter without alerting UNSC forces. After diverting seventeen of his ships to target key ground targets, 'Vadamee himself participated in the attack on the UNSC's headquarters. The battle was over shortly and Camber was glassed, with only 81,313 of the orignal 5.6 million population surviving.
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