How is Pip rescued from Orlick?

In chapter 53 of Charles Dickens's Great Expectations (1861), Philip Pirrip (nickname: Pip) is lured by an anonymous letter to a sluice house. Once he arrives, he is ambushed by Dolge Orlick. A noose is put around Pip's neck, and he is tied to a ladder.
Orlick was first introduced in chapter 15 and resents Pip for a variety of reasons. At this time, he reveals some of them to Pip. He believes Pip is the reason that Biddy did not fall in love with him, and he hates that Pip was preferred over him as an apprentice. On this occasion, Orlick also confesses to the attack on Mrs. Joe.
Just as Orlick grabs a hammer to kill Pip, the latter is rescued by Herbert, Startop and Trabb's lad. Herbert later reveals that they managed to arrive just in time because he had found the anonymous letter at Pip's apartment and—worried for his safety—had decided to chase after him. The three men attack Orlick (who escapes) and then take Pip away to the town.