Attack on the Resistance fleet

The Attack on the Resistance fleet was a battle that took place in the vicinity of the Crait System during the war between the First Order and the Resistance following the Evacuation of D'Qar. The First Order managed to track the Resistance fleet through hyperspace, forcing the Resistance to flee in search of a way of escape before their fuel supplies ran out in 18 hours.

Prelude
The First Order mounted an attack on the Resistance base on D'Qar after the Resistance managed to destroy their superweapon Starkiller Base before it could destroy D'Qar. The Resistance managed to flee D'Qar before their base was bombed by a Mandator IV-class Siege Dreadnought. Commander Poe Dameron led a bombing run that successfully destroyed the dreadnought, but at a high cost, causing General Leia Organa to demote him to Captain as the Resistance jumped to hyperspace.

The chase begins
When the Resistance jumped out of hyperspace, they were suddenly confronted by the First Order fleet, which was led by Supreme Leader Snoke's Star Dreadnought, the Supremacy. The fleet had managed to track them through hyperspace, despite that previously being unheard of. Caught completely off-guard, the Vigil was fired on and destroyed by the massive ship before it could either get out of range or raise its deflector shields. Knowing that the First Order would just pursue them if they went to hyperspace again, which would deplete their fuel levels, the Resistance piloted their fleet out of the First Order's range and their fighter pilots prepared to go out and attack. However, Snoke's apprentice Kylo Ren and two other pilots took TIE Fighters to take out the Resistance's command ship Raddus. Ren blew up the hangar, destroying the Resistance's X-wing starfighters, and the squadron, via Lieutenant Poldin LeHuse, blew up the bridge, killing all the Resistance officers on it except for Organa.

Organa was placed on life support, and Vice Admiral Amilyn Holdo was placed in command of the Resistance fleet. Dameron suggested that they come up with a strategy to attack the First Order fleet, but she was intent on maintaining their current course of action. Meanwhile, Finn was caught trying to desert the Resistance by maintenance worker Rose Tico and thrown into the brig. However, after revealing his knowledge of the Supremacy workings, Finn and Tico got the idea to disable the First Order's hyperspace tracking capability. They told Dameron about this, and they contacted Maz Kanata, who was too busy to help them but knew a codebreaker who could get them into the Supremacy who resided on Canto Bight on the planet Cantonica. Finn and Tico took a Resistance transport pod to find the codebreaker.

On the Supremacy, Snoke formed a connection between Ren and the Force user Rey in order to discover the location of the last Jedi Luke Skywalker. Rey decided to come to the Supremacy to see Ren, believing she could convert him to the Light side of the Force.

The Resistance's counterattack
The three remaining Resistance ships continued to outrun the larger First Order vessels, their speed and strong shields able to keep them just out of range enough for the Supremacy turbolasers to be ineffective. However, their fuel reserves were dangerously low and one by one the other ships ran out of fuel and were immediately destroyed once they had drifted into range of the enemy. The Nebulon-C escort frigate Anodyne, which was also their medical frigate, was the first to run dry and was shortly followed by the Free Virgillia-class Bunkerbuster cruiser Ninka, though both their crews successfully managed to evacuate their doomed craft before their destruction. This left the Raddus as the sole cruiser, carrying what now amounted to the entire Resistance. Vice Admiral Holdo revealed her plan to evacuate the Resistance on small transports. Believing the action to be too risky and foolish, Dameron incited a mutiny and had the leadership held at gunpoint as he went to contact Finn and Tico. The two had found a codebreaker named DJ who successfully got them onto the Supremacy.

Meanwhile, Rey arrived at the Supremacy, but Ren had her arrested. She was taken to Snoke, who tortured her to discover Skywalker's location before ordering Ren to kill her. However, Ren instead killed Snoke by using the Force to cleave him in two with Rey's lightsaber. After killing Snoke's Elite Praetorian Guard, Ren offered Rey the chance to rule the galaxy with him. Rey refused, and the two battled over Rey's lightsaber, which ripped it in half and knocked Ren out. Rey escaped on Snoke's escape ship, and Ren woke up right as General Hux was about to assassinate him. Ren then declared himself the new Supreme Leader.

Aboard the Raddus, Holdo fought back against Dameron's mutiny as she and her allies stunned his allies. Meanwhile, Finn, Tico, DJ, and BB-8 infiltrated the Supremacy and got into the room where they could disable the tracker. However, BB-9E had found the group out earlier, calling in rienforcements, causing them to be confronted by Captain Phasma and her troops. As Dameron heard about the capture, General Organa broke into the room he locked himself in and stunned him, returning him to Holdo as the Resistance fighters prepared to evacuate the Raddus. However, Holdo stayed onboard to confront the First Order in an act of self-sacrifice, and when Dameron came to, Organa revealed that they were near an old rebel base on the planet Crait and that Holdo knew the First Order would be less likely to spot their smaller escape ships. However, because DJ knew about the transports, via, an overheard conversation between Rose and Finn, and told the First Order about it, the Supremacy shot at the escape vessels with turbolaser batteries, destroying a considerable number of them. They initially paid no mind to the Raddus until Hux realized that Holdo was preparing to ram through the fleet at lightspeed. Holdo then jumped into hyperspace, and the collision tore apart the Supremacy and multiple other Star Destroyers.

On the Supremacy, Finn and Tico were about to be executed when the sudden destruction of the ship sent everyone into chaos. The duo freed themselves and attempted to make for a nearby shuttle, only for Phasma and her stormtroopers to emerge from the flames and begin firing on them. Suddenly, an AT-ST started firing on the latter, revealed to be piloted by BB-8. In the chaos, Finn engaged Phasma with a Z6 riot control baton, and was initially overpowered, but managed to hit Phasma with a surprise attack before she fell into a fiery pit. They then escaped and rejoined the Resistance ships as they headed for the old rebel base on Crait. Hux eventually made his way to Snoke's throne room, and discovered Ren unconscious and Snoke cleaved in half. Hux initially considered taking the opportunity to shoot Ren, although Ren regaining consciousness forced him to put away his concealed blaster and abandon that plan. Ren then lied by claiming Rey killed Snoke and tried to assume command of the First Order, but Hux refused to either acknowledge Ren as Supreme Leader or grant him command of his troops. However, Ren proceeded to implement a Force choke on Hux in return, causing the latter to ultimately "acknowledge" Ren's promotion to Supreme Leader. The newly-made Supreme Leader Ren then commanded the First Order's remaining forces onto Crait, where the assault would resume on land.

Appearances

 * Star Wars: Episode VIII The Last Jedi
 * Rose and Finn's Mission