Bravo Fleet Timeline

2100s

Events of Note

2151	USS Enterprise NX-01, the first Warp Five ship of human design, launches. What follows is a new era in human exploration and involvement in the affairs of the galaxy. (ENT begins)
2153	The events of the Xindi Incident unfold, in which the Xindi Council launches a surprise attack on Earth that kills seven million people. Earth's response ends in a diplomatic resolution when the Enterprise NX-01 assists in resolving internal Xindi political conflict.
2155	The xenophobic terrorist group Terra Prime attempt an attack on Starfleet Command in an effort to force all aliens from the Sol system. They fail, paving the way to closer human-alien relations. (ENT ends)
	The USS Defiant NCC-1764 is seized from Tholians control by Terran Empire of the Mirror Universe. The ensuing internal power struggle in the Empire ends with the founding of the Sato Dynasty.
2156	The Earth-Romulan War begins
2160	The Earth-Romulan War ends
2161	The United Federation of Planets is founded.

2200s

Events of Note

2245	The Starfleet ship USS Enterprise NCC-1701 is launched from the San Francisco Fleet Yards and named after one of the most famous ships in human history. Captain Robert April assumes command.
2254	The USS Defiant NCC-1764 is launched.
	The USS Enterprise NCC-1701 encounters the Talosians. The danger of their mission results in the Federation imposing General Order 7, forbidding anyone from approaching or making contact with the planet, under penalty of death (The Cage)
2256	The First Klingon-Federation War begins with the Battle of the Binary Stars. Starfleet suffers heavier losses, but the Klingon figurehead T'Kuvma dies. (DISCO begins)
2257	The Klingon-Federation War ends.
2265	USS Enterprise NCC-1701 crosses the Galactic Barrier (TOS begins)
2268	The USS Defiant NCC-1764 vanishes.
2269	After a mission to Camus II, the USS Enterprise narrowly averts a mutiny when it is discovered Captain Kirk has been replaced by an impostor (TOS ends)
2279	A mysterious energy cloud later identified as V’ger attacks Federation holdings, but is turned back after diplomatic engagement with the Enterprise (The Motion Picture)
2285	The Genesis Device is stolen by Khan Noonien Singh and detonated inside the Mutara Nebula, forming a new planet, Genesis (Wrath of Khan)
	The Genesis planet is found to be highly unstable and tears itself apart soon after its creation (Search for Spock)
	The USS Enterprise NCC-1701 is lost over Genesis.
	Earth is attacked by a probe attempting to communicate with life in Earth's oceans. A world-ending catastrophe is averted only when their message is responded to by humpback whales (The Voyage Home)
2287	Launch of the USS Enterprise NCC-1701-A
	The USS Enterprise visits the Centre of the Galaxy (The Final Frontier)
2293	The detonation of Praxis, a Klingon moon, throws the Klingon Empire into chaos. However, the resulting First Khitomer Accord brings peace between the Federation and Klingons (The Undiscovered Country)
	USS Enterprise NCC-1701-A retired.
	Launch of the USS Enterprise NCC-1701-B (Generations)

2300s

Events of Note

2325	USS Enterprise NCC-1701-B retired.
	Launch of the USS Enterprise NCC-1701-C.
2344	The USS Enterprise assists a Klingon outpost on Narendra III, under attack by the Romulan Star Empire. While the Enterprise was lost, the act of self-sacrifice earned the respect of the Klingon Empire and ushered in a new era of peace and cooperation between the Empire and the Federation.
2347	Hostilities break out between the Federation and the Cardassian Union in the Federation-Cardassian War. These initial conflicts include the Cardassian attack on Setlik III.
2364	The Federation makes first contact with a representative of the Q Continuum (TNG begins)
2366	A truce between the Federation and Cardassia is reached. Though hostilities of the last six years have been on the scale of minor skirmishes, this ends the conflict and begins the several-year process towards a treaty.
2367	The Klingon Civil War begins as the House of Duras challenges the installation of Gowron as Chancellor.
2368	The Klingon Civil War ends with the defeat of the forces of Duras and the discovery of the House of Duras's Romulan backing.
2369	The crew of Deep Space 9 discover a stable wormhole connecting to the Gamma Quadrant in close proximity to the planet Bajor (DS9 begins)

2370s

Events of Note

2370	The Federation-Cardassian Treaty formally ends the Federation-Cardassian War, following the cessation of hostilities three years earlier with the Federation-Cardassian Armistice of 2367, and creates the Demilitarized Zone along the border.
	A group of Federation and former Federation colony worlds declare unofficial war on the Cardassian Union after rejecting the treaty, calling themselves the Maquis. Starfleet Command designates Maquis members to be traitors, while the Cardassian Union deems them terrorists.
	The USS Enterprise-D prevents an anti-time eruption at the Devron system from causing untold chaos in the galaxy (TNG ends).
	The Alpha Quadrant makes first contact with the Dominion when citizens of the Federation and Ferengi Alliance are captured by the Jem’hadar. The subsequent rescue mission is successful, but the USS Odyssey is destroyed.
2371	The USS Voyager goes missing on assignment hunting a Maquis cell in the Badlands. (VOY begins)
	The Cardassian Obsidian Order and the Romulan Tal Shiar attempt a preemptive joint strike against the Dominion in the Battle of the Omarian Nebula. The battle is the first major engagement with the Dominion, and it ends disastrously for the Cardassian/Romulan task force.
	The USS Enterprise-D is destroyed over Veridian III (Generations)
2372	The Klingon Empire invades the Cardassian Union, convinced their government has been infiltrated by Dominion Changeling agents. The Federation objects to this action, causing the Empire’s withdrawal from the Khitomer Accords.
	The Antwerp Conference is bombed by the Dominion. The subsequent tightening of Federation security leads to an attempted coup by Admiral Leyton.
	War breaks out between the Klingon Empire and the Federation with the Empire’s annexation of the Archanis Sector.
2373	The Borg invade the Federation but are halted at the Battle of Sector 001 (First Contact).
	Starfleet forms the Fourth Fleet to counter developing strategic threats to the Federation. Initially intended as a technologically cutting-edge fighting force preparing for future incursions from the Borg, its remit is soon changed and expanded in response to rising aggression by the Dominion.
	The USS Voyager, formally declared lost with all hands, is discovered to have been stranded in the Delta Quadrant when the crew establishes contact with the USS Prometheus NX-74913.
	The Cardassian Union joins the Dominion, and soon after eradicates the Maquis resistance movement. The Dominion sign non-aggression treaties with several powers, including the Romulan Star Empire, the Tholians, Miradorn, and Bajorans.
	The Khitomer Accords are reinstated between the Federation and Klingon Empire.
	The Dominion War begins with the Battle of Deep Space 9, where the Dominion take control of the Bajor sector and the wormhole to the Gamma Quadrant.
2374	The Federation suffers heavy losses in the early months of the Dominion War, most notably with the decimation of the Seventh Fleet at the Tyra system.
	The Klingon-Federation Alliance agrees that better strategic and tactical cooperation between their forces is needed. The Fourth Fleet is assigned as the Starfleet wing of the primary joint force with the Klingon Defence Force for the rest of the Dominion War.
	Deep Space 9 and the Bajoran wormhole are retaken in Operation Return, a successful undertaking between joint allied forces, including vessels of the Fourth Fleet.
	The Federation is defeated at the Battle of Betazed when the Dominion launches a surprise assault that successfully captures the planet.
	The Dominion murder of a Romulan senator breaches their cease-fire with the Star Empire, who soon joins the war on the side of the Federation and Klingon Alliance.
	The Alliance launches their first major offensive with the First Battle of Chin’toka. While ultimately successful, heavy losses prevent further advances beyond this beachhead in Cardassian space.
2375	Admiral Matthew Dougherty of Starfleet and the Son'a attempt a forced relocation of the Ba'ku in order to harvest the metaphasic radiation from their planet's rings. Captain Jean-Luc Picard and the USS Enterprise-E crew stage a rebellion, and convince the Federation Council to allow the Ba'ku to remain on their planet (Insurrection).
	The Breen Confederacy becomes formally allied with the Dominion, and launches a devastating surprise attack against San Francisco and Starfleet Headquarters.
	The Second Battle of Chin’toka drives the Alliance out of Cardassian territory, aided by Breen energy dampening technology.
	Legate Damar forms and leads a rebellion to drive Dominion occupation and Breen influence from his people’s worlds. In his rallying speech, he cites the losses of seven million Cardassian soldiers in the war.
	General Martok assumes leadership of the Klingon Empire after Chancellor Gowron is killed in a duel.
	Zek is succeeded as Grand Nagus of the Ferengi Alliance by Rom.
	Damar’s rebellion is crushed. The Cardassian settlement Lakarian City, population two million, is destroyed by the Dominion as punishment for this insurrection.
	The Federation, Klingon, and Romulan Alliance win the Battle of Cardassia and extract a complete Dominion surrender.
	Cardassian forces turn on the Dominion at a crucial point in the Battle of Cardassia. Further retaliation from the Dominion comes with the order of the absolute eradication of the Cardassian people. An early casualty estimation puts the Cardassian dead at eight hundred million.
	The Dominion War comes to an end with the Treaty of Bajor. It includes the complete withdrawal of Dominion forces from the Alpha Quadrant and the return of all Dominion-occupied Alpha Quadrant territory to its previous sovereign powers. The Breen-Dominion Alliance ends and the Cardassians return to being an autonomous power (DS9 ends).
2376	Federation assistance to the Cardassian Union begins. This places certain restrictions upon the Union, unable to consider expansion towards Federation territory as it remains reliant upon Starfleet assistance.
2377	Bajor officially joins the Federation. Integration of Bajoran Militia officers into Starfleet begins.
2378	The USS Voyager returns to the Alpha Quadrant after destroying a Borg transwarp hub, dealing a significant blow to the Borg Collective (VOY ends)
2379	The Romulan Senate is assassinated and an officer named Shinzon is narrowly prevented by Romulan and Starfleet forces from staging a coup d'etat (Nemesis)

2380s

Events of Note

2380	After years of quietly increasing their militarisation, the Pakleds open hostilities against the Federation. A period of conflict follows between Starfleet and the Pakled fleet, which is largely made up of technology and craft salvaged from other powers. (Lower Decks begins)
2381	Pakled Planet is destroyed by a Varuvian bomb. Starfleet officers are initially blamed, until an investigation reveals the Pakleds did this themselves to try to force the Federation to relocate then in compensation to a more resource-rich planet.
	The fully-automated Texas-class Starfleet ships go rogue and attack Federation facility Douglas Station. Most of the Texas-class ships are destroyed in the ensuing fight, and the entire project of automated starships cancelled.
2383	Starfleet is devastated by the sabotage of the USS Protostar, an exploration vessel that returns to Federation space with a virus hidden aboard to turn Starfleet ships against each other. Many ships are destroyed or damaged before the virus is stopped. (Prodigy begins)
2384	Tensions rise between the Federation and Romulans with reports of forced resettlement of Romulan civilians and seeming breakdowns of discipline in the navy. Fleeing citizens and defecting officers report some pending planetary crisis on Romulus.
	The Romulan Star Empire admits they have learned the Romulan star is facing a sudden and unexpected supernova, expected to kill at least nine hundred million Romulans without additional aid.
	Starfleet offers assistance in the resettlement of refugees, a move that proves unpopular among certain members of the Federation, including Vulcan.
2385	Starfleet assists the Romulan Star Empire in the resettlement of refugees fleeing the impending supernova of the Romulan sun. Many are placed on what is originally intended as a temporary basis on worlds of the collapsing Romulan Neutral Zone.
	On April 5, synthetic workers at Utopia Planitia Fleet Yards stage a sudden attack that destroys the yards and a rescue armada intended to aid the Romulans. The Martian atmosphere is set ablaze and almost 100,000 people die.
	After these multiple fatal disasters caused by automated weapons or compromised automated technologies, Federation Council places a ban on synthetic lifeforms.
	Federation member worlds again state their opposition to supporting the Romulan evacuation, threatening to rescind their membership. Starfleet abandons its evacuation plans.
2386	Federation withdrawal of resources reaches the Cardassian relief efforts, which finally halt. This precipitates the decline of power of the Detapa Council and a return of the military Central Command's authority, the two factions entering a shadow war for supremacy.
2387	The Romulan supernova occurs, destroying Romulus. Damage beyond the system is mitigated by the efforts of Ambassador Spock, whose ship is lost in the creation of the black hole that absorbs the supernova.
	The Romulan Star Empire splits into multiple factions with the loss of Romulus. The Empire persists in a smaller form, led by the Praetor and largely supported by the navy. The Romulan Free State splits off, supported by the majority of the Tal Shiar to maintain stability. The Romulan Republic is established as a democratic faction with a small but modern military. The entirety of Romulan space is in dispute by the major factions and consistently hindered by smaller pirate, rogue or rebel factions.
2388	The Romulan Republic establishes several peace treaties with the Federation and the Klingon Empire. These positive relations would persist and define the Republic’s foreign policy.
	The Sovereignty of Kahless breaks off from the Klingon Empire and opens hostilities with the Empire and Federation. Klingon insistence that the Sovereignty are an internal problem undermines Federation efforts to combat the threat.
2389	The Sovereignty of Kahless attacks and annexes multiple worlds on the Klingon-Federation border.

2390s

Events of Note

2390	The Klingon Empire formally condemns the Sovereignty of Kahless for its invasion of Federation space and joins forces with Starfleet against them.
2391	Klingon vessels assumed to be part of the Sovereignty of Kahless attack and destroy Xavier Fleet Yards.
	Operation: Gatecrasher, comprised of a joint force between Starfleet and the Klingon Defense Force, liberates Federation worlds conquered by the Sovereignty. The Sovereignty’s fleets are destroyed, their leaders killed, and the Sovereignty defeated.
2394	A Klingon raiding party attacks the annual peace conference at Khitomer. At the same time, covert attacks such as cyber operations, sabotage, and terrorist bombings are inflicted on the Federation and the Klingon Empire.
	Starfleet Intelligence identifies the House of Mo'Kai, aided by survivors and remaining loyalists of the Sovereignty, as responsible for these attacks. The next five years continue to be marked by this insurgency violence, subtler than the Sovereignty’s outright political aggression, by a similarly extremist Klingon faction.
2396	Raids of trading ships between the Federation and Cardassian Union become a commonplace threat, usually perpetrated by untraceable pirate vessels. Suspicions that Cardassian Central Command is responsible, trying to undermine the authority of and cut off resources to the Detapa Council, cannot be proven.
2398	Cargo convoys to the Cardassian Union continue to be attacked by Cardassian ships. The Federation at last revokes all trade agreements, blaming the Detapa Council for negligence at best, culpability at worst. This all but collapses the Cardassian Union's foreign trade and triggers a fresh economic crisis.
2399	The return of the True Way in the Former Demilitarized Zone causes Starfleet to reopen limited engagement with the Cardassian Union. Cooperation between both powers begins to restore stability to the afflicted region.
	A Breen raid on Guardian Station and Barzan II marks a resurgence in tensions and hostilities on the border between the Federation and the Confederacy.
	The Hunters of D'Ghor begin a series of raids on the Federation worlds of the Archanis Sector. With local defence forces outmatched, the Fourth Fleet is dispatched to protect the region, culminating in the Battle of Archanis.
	Starfleet and Romulan Free State forces almost come to blows in orbit of the distant planet Coppelius. The situation is diffused, but leads to the revelation that the Tal Shiar were responsible for sabotaging Federation synthetic workers that went rogue in 2385, causing the Attack on Mars. The Federation Council immediately lifts the ban on synthetic life. (PIC begins)
	Manifestations of the Omega molecule across the galaxy send the Federation into chaos. Starfleet implements the Omega Directive and conducts a classified operation to understand the cause: technology of the ancient Tkon Empire that has degraded over the millennia. The location and repair of a series of devices designed to create and maintain the Galactic Barrier ends the crisis.

2400s

Events of Note

2400	The manifestation of the Century Storm in the Paulson Nebula threatens the lives of all living and working in the region. The Fourth Fleet launches a response from Starbase Bravo to evacuate civilians, protect against the storm's effects, and attempt to halt the phenomenon.
	The Romulan Star Navy launches a coup against the Senate of Rator. The slow collapse of the Empire leads to many regions declaring independence, including the Velorum Sector. When its provision government requests Starfleet aid and protection against external forces, the Fourth Fleet is dispatched on Operation: Sundered Wings to lend support amid the chaos of the falling empire.
	The Star Empire of Rator collapses as vast swathes of territory secede, claiming independence or aligning themselves with the Free State or Republic. Rator's territory is reduced to a smattering of systems, leaving the Free State as the de facto successor to the Star Empire of Romulus, and large regions unaligned, wild, and dangerous.
	A mysterious mineral named Blood Dilithium manifests in the Gradin Belt in the Delta Quadrant. Amid aggressive expansionism of the xenophobic Devore Imperium and the chaos of a 'gold rush' from the Alpha Quadrant, the Fourth Fleet is dispatched to restore order and learn more of the substance's origins. Ultimately, the aberrant dilithium is destroyed, freeing the telepathic echoes of victims of Devore brutality.
2401	The Dominion fleet assumed lost in the Bajoran Wormhole in 2401 appears in the Deneb Sector and launches an attack on the Federation, aided by the Breen. Starfleet Command dismisses the assault as only a Breen border raid, and Fourth Fleet commander Admiral Ramar rebels to dispatch forces to free and secure the frontier.
	Starfleet is shaken in their Frontier Day celebrations by a Borg attack, as young officers fall seemingly spontaneously under the Collective's control. The control is disrupted and the Borg ship and Queen responsible destroyed by Admiral Jean-Luc Picard and the former crew of his Enterprise. This sheds light on the renegade Changelings who infiltrated Starfleet to enact the Borg's plan. The loss of many experienced officers to the Borg's attack and Changeling replacement leaves gaps in Starfleet senior command that promises to impact the organisation for a generation.