During Atticus's summation to the jury, he speaks about Tom's courage in dealing with the charges against him.
"And so a quiet, respectable, humble Negro who had the unmitigated temerity to 'feel sorry' for a white woman has had to put his word against two white people's." (Chapter 20)
Scout recognizes her father's bravery in taking on the Tom Robinson case, and when the jury returns to deliver its verdict, she sees that it
... was like watching Atticus walk into the street, raise a rifle to his shoulder and pull the trigger, but watching all the time knowing that the gun was empty. (Chapter 21)
Tom's friends in the balcony also see the courage that Atticus has displayed, and they stand in unison to honor him as he passes below.
"Miss Jean Louise, stand up. Your father's passin'." (Chapter 21)
Atticus shows a courageous form of restraint when he refuses to fight Bob Ewell on the city streets. After Bob asks if Atticus is "too proud to fight," Atticus responds that he is only "too old." Miss Maudie bravely defends Atticus at the Missionary Circle tea after Mrs. Merriweather criticizes him, telling her icily that
"His food doesn't stick going down, does it?" (Chapter 24)
And there are several examples of bravery shown on Halloween night after Bob Ewell makes his attack on the children. First Jem defends his sister, and then Boo Radley finally makes his first appearance in the novel, coming to their rescue and killing Bob. Boo
... gave us... our lives... Autumn again, and Boo's children needed him. (Chapter 31)