Here's a summary of Bilbo's rescue:
* Bilbo uses his wits: Realizing the trolls are obsessed with time, Bilbo cleverly uses his knowledge of clocks and watches to confuse the trolls. He changes the time on their pocket watches, causing them to argue about whether it's morning or afternoon.
* The trolls bicker and delay: While the trolls fight amongst themselves, the dwarves gain the upper hand in the fight. They are aided by the fact the trolls are distracted and becoming increasingly frustrated with the time.
* The sun rises: As the sun rises, the trolls, unable to stand the sunlight, turn to stone. This is a crucial element, as it frees the dwarves and allows Bilbo to escape.
* Bilbo emerges triumphant: Bilbo escapes the cave and rejoins the dwarves, now freed from the trolls. He has saved the day through his clever thinking and quick action.
Bilbo's rescue of the dwarves highlights his resourcefulness, his ability to think on his feet, and his courage in the face of danger. He is no longer simply a timid hobbit, but a resourceful and valuable member of the expedition.