Explanation:
There's nothing really sentimental about groaning and no loneliness in an action that is being done by a group of people. Also, no idea of violence is to be found in the except.
What he does is to describe in a poetic way the held in cries of a sad group of people, with sounds stuck in their throats that, when come out, do so as nothing more than a groan. There's a beautiful use of Onomatopeia and Rhyme to convey such a thing.
Answer:
Poe uses rhyme, assonance, and onomatopoeia to create a mournful mood.
