6th September, 2941 [The Hobbit]
- Bilbo learns how to make his way through Thranduil’s Caverns
6th September, 3019 [The Lord of the Rings]
- They (the Travellers) halt in the sight of the Mountain of Moria
7th September, 2941 [The Hobbit]
- Bilbo finds Thorin’s cell
What was his surprise one day to overhear some of the guards talking and to learn that there was another dwarf in prison too, in a specially deep dark place. He guessed at once, of course, that that was Thorin; and after a while he found that his guess was right. At last after many difficulties he managed to find the place when no one was about, and to have a word with the chief of the dwarves. Thorin was too wretched to be angry any longer at his misfortunes, and was even beginning to think of telling the king all about his treasure and his quest (which shows how low-spirited he had become), when he heard Bilbo’s little voice at his keyhole. He could hardly believe his ears.
[The Hobbit: Chapter 9: Barrels Out of Bond]