Sigma Octanus IV/Grid 13 x 24

. Grid thirteen by twenty-four, on planet Sigma Octanus IV, is a location deep in the jungle on the planet, just outside the outskirts of the city of Côte d'Azur. Though covered by dense foliage, it is also home to a river and several rocky embankments, which serve well to conceal bases.

In the early 2500's, a meteor crashed in this Grid. Unbeknownst to the human colonists, the meteor contained Forerunner artifacts. The colonists took some of the artifacts from the meteor and put them in the Côte d'Azur museum of natural history.

In 2552, during The Battle of Sigma Octanus IV, the UNSC Marines set up a Firebase in Grid 13 x 24, Firebase Bravo. They hoped the embankments would hide the base. Unfortunately, they were wrong. The Covenant ambushed the base and destroyed it, slaughtering most of the Marines when a force of Grunts, Jackals, and Hunters overwhelmed the group. A lucky band of survivors, led by Corporal Harland, managed to make it all the way to Alpha Headquarters, where they were relieved by the Spartans.