To Kill a Mocking Bird Chpt. 6

Did Mr. Radley really shoot at another person or was it in fact Scout, Jem, and Dill? I think he knew it was them because he would have shot them dead. The porch Jem was on was fully lit by the moonlight so it would have been easy to see it was a child. Plus, I am positive most adults cannot fit in a child's pants. What did happen when he went back for the pants? Did Mr. Radley see him?