- June 2513: the United Rebel Front has gathered enough strength for another assault on Eridanus II. Colonel Robert Watts leads the assault to overthrow the government. The United Nations Space Command initiates Operation: TREBUCHET with the intention of using brute force to purify the colonies, a daunting move that gains public support.
- 2513: the United Rebel Front is forced to retreat into the asteroid fields once again, though this time the Insurrectionists must rely on piracy and black marketing to replenish their strength.
- 2513: as part of Operation: TREBUCHET, the UNSC establishes a base of operations on Mamore and assigns an entire division of marines to remain on guard in case of terrorist attacks. NAVSPECWARCOM assigns two squads of Orbital Drop Shock Troopers to locate the leadership behind the Insurrection.