Allegiance - class battlecruiser The " Allegiance " - class battlecruiser was a large warship in the Imperial Navy . Like other vessels in the long - running Star Destroyer design family , it was marked by a distinct wedge - shape . Description . Dimensions . The " Allegiance " - class battlecruiser was similar in appearance to both the " Victory " , " Procursator " and " Imperial " - class Star Destroyers , but was larger than all of them , reaching a length of 2 , 200 meters . Unlike the " Victory " and the " Imperial " , the " Allegiance " - class lacked ventral hangar bays . Like fellow hangarless models such as the " Procursator " and " Tector " - class , the model could seemingly only rely on its own exterior ordnance , as the " Allegiance " appeared to be unable to carry any starfighters or ground vehicles internally . The terraced dorsal superstructure that surrounded the " Allegiance " ' s bridge tower was far smoother than those on the " Imperial " - class , allowing for better armor coverage and less exposure of the inter - plate surfaces . Offensive and defensive systems . The " Allegiance " - class was armed with turreted gun batteries in a similar layout to the dorsal turret guns on the " Imperial I " - class Star Destroyer , albeit with an increased number of guns , six instead of four , due to its larger frame . The ship also had several cannons situated on the mid - axis of the vessel , similar to the batteries located on the mid - axis of the " Imperial " - class models , as well as 3 similar batteries on each side of the ship . Propulsion systems . The " Allegiance " - class battlecruiser had a visible armored reactor bulge on the ventral side of the superstructure , similar to the " Imperial " and the " Victory " - class . Due to scale , it was more massive than on these contemporary Star Destroyers . Bridge tower . The command tower was T - shaped , like the modular towers produced for many Kuat Drive Yards designs . It was put in full view of enemy vessels , which made it an easy target for mass - bombardment by an enemy . The " Allegiance " ' s tower included a visible section that stood out from the rest of the tower , similar to the bridge sections on the " Imperial II " - class Star Destroyer and the " Executor " - class Star Dreadnought . The tower was capped by geodesic domes , like on other contemporary Imperial warships . History . Imperial service . The " Allegiance " - class was in service with the Imperial Navy by 3 ABY . During a rendezvous with the elite unit Death Squadron , prior to the Battle of Hoth , several " Allegiance " battlecruisers formed part of a fleet that was observed by Captain Firmus Piett and Death Squadron ' s commander , Admiral Kendal Ozzel . In service , the " Allegiance " was known as a " Heavy Star Destroyer " and was noted as being typical of the kind of ship that fit the " Star Cruiser " designation of warship . Due to its size , power and combat focus , the class was afforded the designation of " battlecruiser " by the Republic Navy War College at Anaxes , using their warship classification system . " Star Cruiser " , on the other hand , was recognized only by some military historians as a designation for smaller models of battlecruisers . The distinction was used by some to separate ships like the " Allegiance " from larger battlecruiser models like the " Praetor Mark II " . At some point during the time of the Galactic Empire , at least three ships of this class were serviced at the massive Naval Station " Validusia " in the Validusia system . The system was located in the Expansion Region and its Imperial facilities could maintain several heavy Imperial warships at once , including both Star Destroyers , battlecruisers like the " Allegiance " and large dreadnoughts and fleet replenishment ships . During a fleet exercise some time after the Arms Race campaign , a battlecruiser of this class was refueled by an " Altor " - class replenishment ship , alongside an " Assertor " - class Star Dreadnought . The Dark Empire . " Allegiance " - class battlecruisers were pressed into numerous duties during the time of Emperor Palpatine ' s return , including escort duty for even larger command ships and providing protection and support for Palpatine ' s defense forces at Byss , as part of the Byss Security Zone . They were used throughout the Beshqek system to patrol and monitor traffic to and from the secluded throne - world and worked in conjunction with Gauntlet Scanner Station s , destroying any ships the stations identified as hostile . During this phase of its career , serving in the navy of the Dark Empire , the " Allegiance " - class was sometimes referred to as " " Imperial " - class " and a " Super Star Destroyer " by New Republic forces , the former due to its physical resemblance to the " Imperial " - class Star Destroyers . At the Battle of Calamari in 10 ABY , the battlecruiser " Allegiance " served as a command and communications ship for the invasion fleet at Dac and transmitted images back to the command center at Byss . A New Republic task force picked up the transmissions while in hyperspace transit to the system and homed in on their origin . As the fleet jumped out of hyperspace , General Lando Calrissian ordered all ships to fire from his flagship , the " Emancipator " . The fleet bombarded the Imperial battlecruiser and its " Procursator " - class escorts and destroyed both the " Allegiance " and the Star Destroyers . Following the strike , Calrissian ' s fleet passed by the wreckage of the " Allegiance " and began landing their airspeeder reinforcements . Following the Republic victory at Dac , two " Allegiance " battlecruisers escorted Palpatine ' s flagship , the dreadnought " Eclipse " , as it traveled to the Cyax system to confront the New Republic leaders . Ships of the class later participated in the Battle of the Emperor ' s Citadel , the failed attempt by a Republic strike team to infiltrate Byss and topple Palpatine . End of service . By the time following the Second Galactic Civil War , any ships of the " Allegiance " - class had presumably all been destroyed or retired , as both the Galactic Federation of Free Alliances and the Fel Empire put their naval focus on smaller , lighter designs and no major powers in the galaxy used Super Star Destroyers anymore due to their expensive upkeep . Behind the scenes . The " Allegiance " - class battlecruiser first appeared in the " Dark Empire " comic series , illustrated by Cam Kennedy . A number of unique vessels appeared in this series and " Dark Empire II " , with the appearance of the " Allegiance " - class being relatively consistent . At one point , the audio book version of Dark Empire calls these vessels both " " Imperial " - class destroyers " and " Super Star Destroyers , " with the appearance in the corresponding comic panel matching what would become known as the " Allegiance " - class . Because of the above mentioned dialogue , fans initially assumed the " Allegiance " belonged to a Super Star Destroyer line called the " Imperial " - class . The most recent canonical incarnation of the design originated as a detailed fan - made 3D model by Ansel Hsiao , who based his design on the Super Star Destroyer " Allegiance " from " " . When approached by Lucas Licensing to provide artwork for " The Essential Guide to Warfare " , Hsiao submitted his own designs in addition to new models , along with their names . The names were recorded in LFL ' s Holocron continuity database . The use of " heavy " in the class - name on his gallery , was Hsiao ' s own invention . According to him , it is not part of the canonical name which was submitted to the Lucas Licensing continuity database . On his Tumblr account detailing endnote trivia in " The Essential Guide to Warfare " , Jason Fry noted the name as officially being " Allegiance " - class battlecruiser , and also explicitly identified the unnamed ships in various panels of " Dark Empire II " as being the same as the " Allegiance " - class battlecruisers . In addition , Fry also attributed the name " Heavy Star Destroyer " as a nickname in canon lore and confirmed that the class ' s specifications were officially recorded . On a related note , the ship - class ' designation was upgraded from a Star Destroyer to a battlecruiser due to the use of the Anaxes War College System that was created for " The Essential Guide to Warfare " . The " Bellator " - class dreadnought had something similar occur , where its ship designation was changed from Star Battlecruiser to dreadnought . Besides Hsiao ' s artwork in the book , the design can be seen in another painting , by Tommy Lee Edwards . The image uses a picture from Hsiao ' s personal gallery as a background , originally titled " Strategic Reserve , " where three members of the ship class appear , although two are cut off by the top edge of Edwards ' painting . The third ship is to the right and in close proximity to Firmus Piett and Kendal Ozzel , facing away .