In 2552, Sector B was one of the Covenant's main incursion points in the Battle of Mombasa during the Battle of Earth. They landed heavy armor, including Wraith tanks and Ghosts with air support from Phantoms and Banshees in the sector. UNSC Marines from the 405th Division were sent to the area as well, but were pinned down until help arrived from the reinforcements provided by the UNSC In Amber Clad, including John-117. A Scarab walker retreated there as well, having traveled down the NM 105 E to the city to get a clear line of sight at the New Mombasa Orbital Elevator. The Sector was destroyed when the Covenant began excavating The Artifact.