Some of these, congregating about the inn-yard while we changed horses, told us of great sheets of lead having been ripped off a high church-tower, and flung into a by-street, which they then blocked up.
There are no more uses of "congregate" in the book.
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People congregated outside of City Hall to protest.
It was in the quiet at the end of the day, when we began to congregate in the open space before climbing into our caves.