2560

2560 was a year in the 2560s in the 26th century.

January

 * January 8: Spartan Horvath attempt to destroy one of the Gorespike cannons, but encounters a banter between 2 Banished Sangheili.
 * January 20: Spartans Griffin and Kovan learn that the Banished will turn to infighting and make a plan to assassinate War Chief Escharum.
 * January 23: Fireteam Taurus asks Spartan Vettel to stay behind at the remnants of the UNSC Mortal Reverie as they begin preparations for Escharum's assassination.
 * January 30: Escharum's assassination backfires and he orders Tremonius and his Banished forces to assault the Mortal Reverie. Spartan Griffin sends an SOS to the squad and warns of an invading Banished force.
 * January 31: Spartan Stone learns that the Banished are planning a massive invasion force heading for the Mortal Reverie at Riven Gate. Spartans Makovich and Vettel prepare the UNSC remnants to defend the Mortal Reverie.

February

 * February 2: The Mortal Reverie fall to the Banished forces led by Tremonius. Outpost Tremonius is named after this Banished victory by Escharum's recommendation.

March

 * March 3: The surviving Spartans enact the Rubicon Protocol, a contigency plan to halt the advancing Banished forces on Installation 07 by any means necessary.

April

 * Before April 23: Escharum forces combat medic Lucas Browning to open the Cylix unearthed by Tremonius containing The Harbinger before being transported to Chak 'Lok's Tower and eventually the Harbinger's chamber.
 * April 23: Spartan Stone learns that the Banished are transporting Forerunner technology to a site called the Conservatory from scouting Outpost Tremonius.
 * April 24: Spartans Makovich and Sorel learn that Escharum and the Harbinger are planning on capturing 117649 Despondent Pyre, monitor of Installation 07.
 * April 26: Spartan Stone discovers the Weapon's signal underneath the surface of Installation 07 before being ambushed and killed by Jega 'Rdomnai.
 * April 29: Spartan Vettel learns that Spartan Griffin is locked away inside Chak 'Lok's Tower and attempts a daring rescue, but fails.

May

 * May 15: Spartans Makovich and Sorel enter the Conservatory and follow the Banished inside, but are ambushed and kiled by the Hand of Atriox, composed of Jega 'Rdomnai, Hyperius, and Tovarus.
 * May 26: Spartan Horvath sends a final transmission to the UNSC survivors, pleading for John-117 to return and turn the tide against the Banished.
 * May 28:
 * John-117 is recovered from the remnants of the battle between the UNSC Infinity and the Banished by Echo 216 and its pilot. A resurgent conflict on the Halo takes place on this day.
 * Escharum discovers that John-117 has returned thanks to the latter's participation in the destruction of the Ghost of Gbraakon.
 * John-117 recovers the Weapon underneath the surface of Installation 07 and defeats Tremonius.
 * John-117 rescues the captured Marines, takes down various high-value targets, assists the survivors in capturing various Forward Operating Bases or FOBs, and shuts down various Banished facilities.
 * John-117 defeats Chak 'Lok inside his Tower and learns of a Banished mining operation into the Conservatory thanks to Spartan Griffin, who dies of his torture.
 * The Weapon helps John-117 defeat Bassus at the Excavation Site and shut down the drill preventing entry into the Conservatory.
 * The Weapon learns of a mysterious entity worse than the Flood recovered from a past exchange between Cortana and 117649 Despondent Pyre prior to the arrival of the UNSC Infinity.
 * John-117 meets the Harbinger, whose plans are to free the Endless from the Cylixes.
 * John-117 and the Weapon learn that the Harbinger and the Banished are planning to repair Installation 07 through Forerunner Spires.
 * Echo 216 gets shot down by 3 Banished AA cannons en route to the Command Spire.
 * John-117 disables the AA cannons and defeat Hyperius and Tovarus.
 * The Harbinger springs a trap on the Weapon while extracting the data needed to enter the Command Spire.
 * While exploring the Command Spire, more of Cortana's past actions are revealed, including her role in the destruction of Laconia Station at the hands of the AI Leonidas.
 * John-117 shuts downs all of the Spires, but the Pilot is captured by Jega 'Rdomnai.
 * En route to the Pilot's rescue, the Weapon discovers that Cortana destroyed Doisac because Atriox refused to join the Created.
 * John-117 survives the House of Reckoning, defeats the remaining Banished leaders, and rescues the Pilot.
 * John-117 and the Weapon discover the true purpose of the Silent Auditorium, the site of Cortana's sacrifice, and defeats the Harbinger.
 * May 31: Echo 216 picks up John-117 and the Weapon from another location within Installation 07. The pilot is revealed to be Fernando Esparza, a civilian engineer. Atriox discovers the Endless in their Cylixes.

October
October 27
 * John-117 was accidentally declared KIA on this date by ONI Section II Press Secretary Lieutenant Penelope Boren, who was meant to say "2558" instead of "2560".