How did Jem and Scout meet Dill?

Dill was staying with his aunt, Miss Rachel. The children met him one morning when they heard noises coming from Miss. Rachel's yard. Her dog was expecting puppies, and the children went to investigate. It was there that Jem and Scout met Dill.

Early one morning as we were beginning our day’s play in the back yard, Jem and I heard something next door in Miss Rachel Haverford’s collard patch. We went to the wire fence to see if there was a puppy— Miss Rachel’s rat terrier was expecting— instead we found someone sitting looking at us. Sitting down, he wasn’t much higher than the collards.