Examples of courage--big and small--abound in Chapter 15 of To Kill a Mockingbird. The most obvious case comes when Atticus decides to stand alone outside the jail to defend Tom Robinson against the lynch mob. Atticus risks his own safety (and possibly his life) in doing so. Scout unknowingly shows her brave side when she comically battles one of the men who has "yanked Jem nearly off his feet."
I kicked the man swiftly. Barefooted, I was surprised to see him fall back in real pain. I intended to kick his shin, but aimed too high.
She then engages Mr. Cunningham in an innocent conversation that shames the men into leaving empty-handed. Jem's loyalty is tested when Atticus orders him to leave, but Jem bravely stands by Atticus, recognizing that the men mean to harm his father. B. B. Underwood (who "despises Negroes") silently stands guard above the men with a shotgun from his perch in the newspaper office.