The difference between the words swarmed and assembled should give you a clue as to what the answer is. Swarmed means to move somewhere in large numbers, usually crowding around something of interest to get a closer look. Assembled means to gather together in one place for a particular reason. This is usually done in an orderly fashion.
Mark Twain's greatest inspiration from his novel was his mother, his friend Will Bowen, and the slaves he encountered and a child. He mirrored the Character of Tom Sawyer as himself in the novel. I hope i helped!
Mistaken interoitation, and discussion of feelings