Fallen War

The Fallen War was a brief, yet devastating war that ended the Galactic Rebellion and nearly brought the fall of the Galactic Empire and Rebel Alliance.

Origins
Towards the end of the Galactic Rebellion, the Galactic Empire was near collapse from several defeats at the hands of the Rebel Alliance. Appearing from the beyond the Outer Rim, several large fleets of unknown origin began to attack Rebel controlled planets and colonies. Behind the attack was a man known only as the Fallen. While his fleet was not as vast as the Rebel Alliance's or the Empier's military, years of warfare between the two side left them weakened.

Seeing that Rebel controlled planets were under attack, Emperor Palpatine sent envoys to Fallen's fleet in order to broker a peace between the two side, in hope that it would spare the Empire so it could regroup and rebuild its strength. The envoys were killed before they reached Fallen. Soon after, Imperial controlled planets came under attack, revealing that he would not declare peace with either side. Over the next few months, both the Empire and Rebel Alliance suffered several defeats. With both sides on the brink of collapse, the Rebel Alliance offered the Empire a peace treaty in order to combine their forces for a final assault against Fallen.

While hesitant at first, the Empire finally agreed on the alliance and signed the peace treaty when Fallen's forces pushed them back to Coruscant. With a combined assault, Fallen's forces were pushed back to Rhen Var. It was here that they were surrounded and destroyed.

Aftermath
Both the Galactic Empire and Rebel Alliance were brought to the brink of collapse by the end of the Fallen War. While the war lasted less than a year, nearly 80% of Rebel and Imperial forces were destroyed. For several years, neither side was strong enough to govern the territory they once had, leading to the formation of other smaller factions. Eventually, the Rebel Alliance, backed by funding from several star system, was able to recover and reform into the New Republic. The Galactic Empire never fully recovered, reforming into the Imperial Remnant and giving up a majority of the territory that the Empire once controlled.