Defiant

The Skywalker, supposedly formerly known as the 'USS Normandy', was a ship found floating through deep space by a rebel task fleet and the template for the Skywalker class Starcruiser.

History
In 3 ABY, a rebel task force sent to destroy an Imperial base near the middle rim planet of Camildrona encountered a bizzare shaped ship floating through space. The ship was first sighted by the leader of the task force, Admiral Gree Noggray, who had come out of hyperspace to investigate floating debris sighted by radar. Noggray ordered the ship to identify itself, and when it couln't reply, the Admiral gave orders to board the ship. the 188th Rebel Legion was assigned to board the ship, under the command of Rebel General CT-4822 "Ace", a veteran of the Clone Wars.

The legion boarded the ship, and were met by a friendly group of humans and aliens, who identified the ship as the USS Normandy, and its captain H.T. 'Hudson' Kirk. They claimed to be representatives for the United Federation of Planets, from a different galaxy, and also claimed to have accidentally been sucked into a hyperspace wormhole, which they called a "warpspace wormhole", and taken back to a different galaxy at least 360 years in the past. They admitted, however, that the technology in that galaxy seemed much more advanced than the technology than their home galaxy. The rebels, seeing what they had been through, took them in, only condition was that for now they would become loyal soldiers of the Rebel Alliance and their ship would be part of the rebel fleet, until they could find the survivors a way back to their own galaxy.