List three example of when Atticus had to use courage in To Kill a Mockingbird.

Atticus is the model of courage in the novel. 

First, Atticus agreed to defend Tom Robinson.  Atticus knew from the beginning that he would lose the case and would be ridiculed. But he still defends him with all his heart. Here is a dialogue that shows Atticus' courage. 

“Atticus, are we going to win it?”

“No, honey.”

“Then why—”

“Simply because we were licked a hundred years before we started is no reason for us...

Atticus is the model of courage in the novel. 

First, Atticus agreed to defend Tom Robinson.  Atticus knew from the beginning that he would lose the case and would be ridiculed. But he still defends him with all his heart. Here is a dialogue that shows Atticus' courage. 

“Atticus, are we going to win it?”

“No, honey.”

“Then why—”

“Simply because we were licked a hundred years before we started is no reason for us not to try to win,” Atticus said.

Second, Atticus demonstrates great courage when he defends Tom Robinson from a mob.  Even though the mob was about to hurt Tom and him, he does not back down.  Atticus is willing to risk his own well-being. Later he admits to Jem that the mob might have hurt him.  From the reader's perspective, Atticus might even have been killed. 

Third, Atticus shows courage in the trial as a lawyer.  As the trial progresses, it becomes clearer that the people of Maycomb are very displeased with Tom and Atticus.  With all this pressure, an average man would have capitulated. However, Atticus did not.  In fact, Atticus was going to appeal after he lost, which shows even greater courage.