The Battle of Mombasa was an engagement during the Battle of Earth, taking place in late October 2552. Over the course of the battle, Covenant forces captured the city of Mombasa, Kenya and it was quickly retaken in a matter of hours by the UNSC. However, after the Prophet of Regret's retreat, the city was occupied by another, larger Covenant force sent by the Prophet of Truth. In the aftermath of the battle, the Portal to the Ark was eventually found by the Covenant, which would prove to be a major determining factor in the final outcome of the Human-Covenant war.