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How does this sentence "did this tumultuous and mournful uproar arise" fit in the whole complex sentence below

I don't know how it (the cry) struck the others: to me it seemed as though the mist itself had screamed, so suddenly, and apparently from all sides at once, did this tumultuous and mournful uproar arise.

Public Comments

1. It is pivotal to the whole sentence and gives meaning to all that went before it. A great literary sentence of weight and atmosphere.
2. Wow! What's it from?! Anyway, I would call the clause in question the second independent clause of the sentence (the part before the semicolon being the first). This rewording should make it clearer: I don't know how it (the cry) struck the others; this tumultuous and mournful uproar arose.so suddenly, and apparently from all sides at once, that to me it seemed as though the mist itself had screamed.