Return of the King

[Eruwen]

It was Merry thinking about how he was alone and had no clue where he was in all the world. They were in the fields of Rohan when he thought this. It was when the Grey Company I believe passes by and Aragorn sits Merry on the ground. I'll give you the quote from the book if you'd like. It is:

Supposing the king's small escort was trapped and overcome, but he escaped into the darkness---alone in the wile fields of Rohan with no idea where he was in all the endless miles? 'No good!' he thought.