P1 was one of three Hammerhead-class corvettes that was sent by Senator Bail Organa to reinforce the Phoenix Squadron, a squadron of rebellion warships and starfighters.[2]
Behind the scenes
P1 first appeared in A Princess on Lothal, the mid-season premier of the second season of Star Wars Rebels, and first identified on the corresponding episode guide on StarWars.com, along with P2 and P3. Star Wars: The Rebel Files identifies the three corvettes as Lightmaker, Duchess Senna, and Amity's Arrow,[5] although it has not been clarified which names corresponds to the ships. The Lightmaker had also appeared in Rogue One: A Star Wars Story[6], albeit also not specified which of the three corvettes it was in A Princess on Lothal.
Appearances
Star Wars Rebels – "A Princess on Lothal" (First appearance)
Star Wars Rebels – "The Protector of Concord Dawn"
Star Wars Rebels – "Homecoming"
"The Gangsters of Galzez"—Star Wars Rebels Magazine 20
Star Wars Rebels – "The Forgotten Droid"
Star Wars Rebels – "The Mystery of Chopper Base"
Star Wars Rebels – "Twilight of the Apprentice"
Star Wars Rebels – "An Inside Man"
Star Wars Rebels – "Secret Cargo"
Star Wars Rebels – "Zero Hour"
Sources
Star Wars Rebels Returns...with Princess Leia on StarWars.com
Star Wars Rebels Season Two – Mid-Season Trailer on StarWars.com
A Princess on Lothal Episode Guide on StarWars.com (First identified as P1)