Trolls' dawn rule

The Trolls' dawn rule is a fixed and inescapable law of the physical world in Middle-earth, governing the fate of trolls who are caught above ground at sunrise. The rule states that trolls must be underground before dawn, or they will turn back into the stone from which they were made and never move again. This principle is not a magical spell that can be broken but an inherent condition of their existence, as immutable as the rising of the sun itself.

Operation and Mechanism

The rule operates with absolute finality. When dawn breaks, trolls who are not safely hidden in a cave or hole undergo an instantaneous and irreversible transformation. As the narrative describes, they "go back to the stuff of the mountains they are made of, and never move again." The process is triggered by the first light of day, which causes the trolls to become "stone" in a literal sense, frozen in whatever posture they held at the moment of sunrise. In the case of William, Bert, and Tom, William stood "turned to stone as he stooped; and Bert and Tom were stuck like rocks as they looked at him." The transformation is so complete that the trolls remain in place indefinitely, becoming permanent features of the landscape, with birds sometimes perching on them.

Key Occurrence: The Rescue from the Trolls

The rule is most dramatically demonstrated during the company's encounter with the three trolls in Chapter II, "Roast Mutton." After the trolls have captured Bilbo and all thirteen dwarves, tying them up in sacks and debating how to cook them, Gandalf returns and uses his wizardry to keep the trolls arguing among themselves until dawn. By mimicking their voices, he prolongs their quarrel over whether to roast, mince, or squash their prisoners. The argument continues until the first light of day appears over the hill, at which point the trolls are instantly turned to stone. Gandalf then steps from behind a tree and helps Bilbo climb down from a thorn-bush, revealing that it was his voice that had kept the trolls bickering until the light made an end of them. This event saves the entire company from being eaten and allows them to discover the trolls' cave, where they find the swords Orcrist and Glamdring, as well as Bilbo's own blade that he later names Sting.

Consequences and Significance

The Trolls' dawn rule has several important consequences within the story. First, it establishes a clear and predictable weakness for trolls, making them vulnerable to any opponent who can delay them until morning. Second, the rule directly leads to the company acquiring three legendary weapons: Thorin takes Orcrist, Gandalf takes Glamdring, and Bilbo takes a knife that serves as a short sword. These blades, forged in Gondolin for the Goblin-wars, prove crucial in later encounters, particularly against the goblins in the Misty Mountains. Third, the rule reinforces the thematic importance of timing and natural cycles in the narrative, where the rising of the sun, the phases of the moon, and the changing seasons all play decisive roles in the characters' fates. The trolls' petrification also serves as a permanent warning to other travelers, as the three stone figures remain standing in the woods for years afterward, a silent testament to the consequences of being caught above ground at dawn.