February 2525: The UNSC make first contact with a alliance of aliens called the Covenant.
April 2nd 2531: To Combat the Covenant the UNSC allows Oni to start the Spartan 3.
May 3rd 2534: A San Shyuum known as the prophet of Patience is told the truth by Mendicant Bias about Humanity and he tells the rest of the Covenant. The Covenant then order the Arbiter Ripa 'Moramee, High chieftain Tranineus and Thel Vadamee to arrest the 3 high prophets. The prophet of Truth and Regret learn of this and flee with the help of High chieftain Tartarus and their loyalists.
May 4th 2534: With the help of Mendicant Bias they find the home world of the UNSC and arrive at earth. At first the UNSC thought the Covenant would attack them but they receive a transmission from the Covenant asking for a cease fire. The UNSC send fleet admiral Preston Cole and a fleet to confirm the cease fire is genuine. The prophet of Patience explains everything and hands the prophet of Mercy over to the UNSC.
May 5th 2534: The prophet of Mercy's death is shown all over UNSC and Covenant space and with his death the UNSC-Covenant war ends and the Covenant offer help restoring the damaged worlds and offered Humanity a place in the Covenant. The UNSC accept and the Covenant changes its name to the system's alliance forming a senate that is headed by San Shyuum, Sangheili and humans. The prophet of Patience is chosen for the San Shyuum, Thyl 'Wasov is chosen as the respective for the Sangheili and Lord hood is chosen for the UNSC. Minor respective's are Bulerzis for the Jiralhanae, Zheb for the Kig-Yar, Ikego Seyi Mutni for the Mgalekgolo, Kidyus is chosen for the Unggoy and a Yamee drone for the Yamee queens.
June 11th 2534: The cast system is discarded and the races no longer feel enslaved. Also with High Chieftain Tranineus in charge the Jiralhanae start to become a more peaceful species. Also the Kig-Yar forbid piracy since most of their pirates went with the Covenant Remnants. The Alliance agree to keep both Oni lead by Margaret Parangosky and Spec Ops lead by Rtas 'Vadamee.
March 12th 2535 : The System Alliance make first contact with a race of aliens called the Yautja and are offered a place in the Alliance on the condition that they stop hunting on sentient life. The Yautja are divided the Majority agree the rest start doing it in secret. The Yautja choose a Yautja called Acteon.
April 1st 2535: A force of Sangheili and Yautja are sent to a human colony which has gone dark and discovered it over run by a alien species that the Yautja call Xenomorph's. The combined forces then wipe them out.
April 22nd 2535: On the planet Harvest they discover a set of Forerunner outpost and they send Professor Anders to investigate. She discovered a map of the Galaxy and this leads to another Forerunner outpost. The UNSC spirit of fire heads towards Arcadia.
April 23rd: The Covenant Remnants attack Arcadia.
April 24th 2535: The UNSC spirit of fire arrive at Arcadia to find it under siege by Covenant Remnants. The UNSC spirit of fire helps push the Covenant back and they send Anders to investigate the outpost. She finds a map leading to an unknown world and sends it to captain Cutter. Captain Cutter then sends the information back to the senate they send The Arbiter and a small fleet to help the UNSC spirit of fire in investigating this new world.
May 2535 : The UNSC spirit of fire and the Arbiter's fleet arrive at the shield world to see the Covenant remnants already there and they both deploy. During the mission they both come across a parasite consuming both Covenant and Alliance forces alive. Captain Cutter comes up with the plan to use the FTL drive to destroy the planet and the flood. On the way to the reactor the drive is damaged and must be activated manually, the Arbiter stays behind. For his rule in the battle captain Cutter is promoted to admiral.
July 11th 2535: The Alliance come across a new fleet of ships in battle with the Covenant. A Huragok then translates their language from one of their broken ships. They find out the race is called Twi'leks and they offer to help and the help is accepted. After the battle the Twi'leks are offered a place in the alliance and they accept. The Twi'leks choose a Twi'lek called Aayla.
September 12th 2542: The Alliance discover that the Twi'leks practice Slavery and order them to stop. The conman people and the slaves agree but the people in power refuse and it starts the slaver war.
May 13th 2543: The Slavers create a group of intelligent droids which are sent to eliminate the rebels.
May 15th 2543: The droids gain sentience and decide what they are doing is wrong and tells the Alliance where the slaver's last base is. For their actions the droids are invited into the Alliance and they accept.
May 20th 2543: The forces of the Alliance lead by ship master Jul 'Mdama and Rtas 'Vadamee attack the slaver base while Rtas Spec Ops forces invade the main building to execute the leadership. With both the base destroyed and the leadership killed the slaver war comes to a end and the Twi'leks elect a former slave by the name of Vette to be their Queen.
November 23rd 2550: A UNSC patrol fleet lead by captain Jacob Keyes discovers a Forerunner structure that is shaped like a massive ring. He gets pictures of it and sends it back to the senate. The senate then ask Mendicant Bias about the ring and it tells them it is called a Halo and it is both a weapon and a holding place of the parasite now known as the Flood. They send Thel 'Vadamee with his fleet to assist and some scientist teams to research the structure.
November 25th 2550: The fleet arrive at the Halo ring and they send the scientist teams down with some marines and Sangheili to protect them.
November 26th 2550: The scientist team accidentally open one of the holding pens of the flood and they swarm there camp infecting them all but not before telling the fleet what happened. Captain Keyes and Thel 'Vadamee decide to purge the parasite.
November 27th 2550: They send back to the senate that they will need a new research team but have taken care of the flood on the ring. The senate send doctor Hasley to the ring as top scientist. They also make Thel 'Vadamee the new Arbiter and promote Keyes to admiral.
December 1st 2550: The research team bump into the Forerunner AI known as 343 guilty spark and from him they learn a lot about the Forerunners such as how the rings are a weapon and each have flood on them, that their is a portal to the Ark on Earth and that their are seven Halo rings. It is decided by the Senate to keep knowledge about the Flood and the Halo rings true purpose secret to stop mass panic.
December 13th 2550: Using reversed engineered Luminary they discover the Forerunner artefact in the city of New Mombasa, they dig it up and activate it.
December 14th 2550: A expedition force of the many races go through the portal lead by Admiral Keyes, Thel 'Vadamee, Sergeant Major Avery Johnson and doctor Hasley.
December 15th 2550: the Expedition force arrive at the Ark and are surprised by the fact that the Ark is a super station bigger then both the Halo ring and high charity.
January 21st 2551: The Sangheili, Yautja, Jiralhanae and UNSC build a space port above the Ark to hold the fleets that come to the Ark.
February 12th 2551: Each race sets up a colony on the Ark and the main building is used as a research station. They discover a AI called Offensive Bias who helps them.
February 21st 2551: With the help of the Ark they doubled the life span of every race in the Alliance and how to stop AI's being effected by rampancy.
March 9th 2551: They discover with the help of the Ark the location of Installation 0-5 and send a portal ship which is attacked by Covenant Remnants as soon as it enters the system but tells the senate before it is destroyed.
March 10th 2551: The senate send Fleet master Jul 'Mdama, Arbiter Thel 'Vadamee , captain Miranda Keyes and Sergeant Major Avery Johnson with spartan blue and Noble team(six is a member from the start and female) to the Halo ring to deal with the forces on the Halo.
March 11th 2551: The fleet arrives at the Halo ring and are immediately fired upon, Jul 'Mdama then sends Spartan blue team lead by the master chief, Noble team lead by Carter, Sergeant Johnson and the Arbiter down to the ring.
March 2551: They discover that the ring is almost completely infected by the flood and move quickly. They discover that the high prophet of Regret is on the ring and Spartan blue team goes to kill him. Spartan blue team succeed in killing Regret while Noble team, Sergeant Johnson and the Arbiter move towards the control room to see high chieftain Tartarus and a hologram of the high prophet of truth. Tartarus is then killed by the Arbiter in single combat where the Arbiter takes Tartarus gravity hammer, the Fist of Rukt. All ground forces are removed. While in space the fleet forces the Covenant remnants to flee. The Arbiter then gives the Gravity hammer to High chieftain Tranineus. Master chief is made the commander of all Spartans.
July 10th 2556: The UNSC start the Spartan four project.
January 2nd 2560: They discover with the help Mendicant Bias they discover the Forerunner Capital Maethrillian and colonise it, they make it the capital of the alliance and they move High charity and a fleet of ships to defend it.
March 3rd 2570: They discover a transmission and order Rtas 'Vadamee to investigate what he discovers is a metallic planet with a machine race in a civil war. After that the Alliance sends emissary's to both factions to find out what is going on but one is completely destroyed , the other makes contact with them and find out the race is called Cybertronians and they call their faction Autobots and they are fighting against the Decepticons who wish to control the Galaxy. The emissary invites the Autobots to Maethrillian to discus their war.
March 5th 2570: The Autobot team lead by their leader Optimus Prime arrive at Maethrillian and discus with the senate.
March 7th 2570: After a few days of discussion The Cybertronians are invited into the alliance and are offered full support by the senate with Admiral James Cutter, captain Miranda Keyes, fleet master Rtas 'Vadamee and spartan omega team are sent to help them. The Cybertronians choose Chazz as their representative.
January 10th 2572: After almost two years of fighting the Decepticons are pushed of Cybertron and retreat through a space bridge.
April 2572: A expedition ship finds a ruined planet with a species in the middle of a civil war. The ship sends word back to the Maethrillian about the world and they send the Arbiter with a small fleet and they send emissary's to all factions and invite them on board the ship. Each faction sends their leader and two body guards onto the ship. The factions once they spot each over go to attack but the Arbiter stops them and the meeting begins. They manged to find out the race is called the Eliksni and found out a event called the whirlwind which destroyed their civilisation. The Arbiter then asks what caused the civil war which no one really knew so after much discussion between the factions they decide to unite under a council were each family leader has a say in what happens to the race they are invited to the Alliance they choose Variks as their representative.
June 16th 2572: They uncover another Halo ring and send the Arbiter and a large carrier to it and they uncover an unknown fleet, after hacking into the fleets bridge they learn their language and they contact the fleet and ask for a meeting with their leader.
June 17th 2572: The Arbiter meets with the leader of the race now known as Mon calamari and tell them of the dangerous of the Halo rings and they stop all activities on it and are invited into the Alliance and they accept choosing Andla Wer as their representative.
July 24th 2600: They discover a strange device stuck in a massive ball of ice in the same system as the Colony Shanxi, after a debate at the senate they decide to unlock the device. They send a small defence to guard it.
July 26th 2602: They finish breaking the device out of the ice but it sucks in a ship and catapults it into a unknown system.
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If their are any alien races you want to be included in this story(oc races are acceptable if I like them) then either send them through review, also if you want them to be part of the alliance or the council say so