Grid Kilo 23 was a sector of the United Nations Space Command city Old Mombasa on the planet Earth. It consisted of a broad highway, and during the Battle of New Mombasa, a Covenant Scarab was defending this grid sector, along with great numbers of other Covenant forces. A UNSC strike force of four Warthogs and three Pelican Dropships were dispatched over Grid Kilo 23 to attack the Covenant Assault Carrier that was commanding the Covenant forces in the Battle of Earth (where the Battle of New Mombasa had originated from).