Sphyrna - class corvette " Sphyrna " - class corvettes , also known simply as Hammerhead corvettes , were a model of corvette that saw wide use in the period leading up to , during the Galactic Civil War and during the cold war , where they would be fielded by a rebel cell as well as the Alliance to Restore the Republic and the Resistance . Characteristics . " Sphyrna " - class corvette s were inspired by a starship design that dated back centuries prior to the Imperial Era that was designed by Corellian Engineering Corporation . Throughout its existence , at least two different variants of the Hammerhead corvette existed . The one most commonly seen utilized by rebel cells as well as by their successor , the Alliance to Restore the Republic , featured its characteristic vertically - elongated bridge , a large ventral cargo bay and three dual laser cannon s . By 0 BBY , the Alliance had either modified its previous Hammerheads or had begun utilizing a slightly different model . This Hammerhead was structurally the same , although it featured several new additions . These included two extra modules mounted to the port and starboard of the craft , six escape pod s in place of the cargo bay , and a fourth sublight drive mounted on top of the primary three , giving it enough power to single - handedly move a disabled Star Destroyer . This was the version used the most during the Battle of Scarif . History . Early rebellion . After learning of the rebels losses at the battle on Garel , Imperial senator Bail Organa of Alderaan dispatched his adopted daughter , Prince ss Leia Organa , along with three Hammerhead corvettes — P1 , P2 and P3 — to Lothal to expand the rebel fleet , under the guise of delivering relief supplies to the people of Lothal . The princess planned for the rebels to steal them to conceal Alderaan ' s involvement with the rebellion , but Lieutenant Yogar Lyste installed gravity lock s to prevent the corvettes from taking off . With the help of former Lothal governor Ryder Azadi , who had constructed the locks while he was in prison , the rebels were able to commandeer the corvettes and add them to their growing fleet . In 2 BBY , the former Sith Lord Maul assaulted one of the rebellion ' s corvettes . He interrogated the crew , leading to Maul capturing the " Ghost " personnel in order to unlock holocron s . Later , Phoenix Cell escorted one of their transport s to evacuate rebel sympathizers at Mykapo in front of an imminent Imperial takeover . The same transport , the red - painted P2 , was later destroyed during the Battle of Atollon . Galactic Civil War . After the rebellion was reorganized into the Alliance to Restore the Republic , several modified Hammerheads partially made up the motley assortment of vessels that was the nascent Alliance Fleet . One such ship was the " Lightmaker " , which was a part in Admiral Raddus ' fleet just prior to the Battle of Yavin , under the command of Kado Oquoné . The vessel was present at the Battle of Scarif . During the battle , Raddus ordered it to ram into the side of the disabled " Imperial I " - class Star Destroyer " Persecutor " , causing it to crash into a second Star Destroyer , the " Intimidator " , and then into the Shield Gate , allowing the Death Star plans to be transmitted from the Imperial base on the planet ' s surface . After the transmission is received by the fleet , at least one Hammerhead corvette , along with some of the fleet began the jump into hyperspace just before the arrival of the " Devastator " . At least one Hammerhead was still in the Alliance Fleet shortly after the siege on Tureen VII . Cold war . One Hammerhead was part of the Resistance navy . The " Sterdic Star " was used during the mission to Taul . Behind the scenes . " Hammerhead " - class corvettes first appeared in " A Princess on Lothal , " the tenth episode of the second season of " Star Wars Rebels " , which also saw the introduction of Princess Leia Organa on the show . The ships are based on the " Hammerhead " - class cruisers from the now Legends video game " " .