What is the theme in The Bride Comes to Yellow Sky by Stephen Crane?

Courage is a central theme in this story. The idea of courage is shown in two conflicting instances and is shown in Jack Potter's character. The first instance is one of a lack of courage, when Jack does not tell the people of Yellow Sky about his marriage, not even by telegraph, and sneaks back into town with his bride. Ironically, the second is also shown through Jack's character when he stands up to Scratchy Wilson, despite having a gun pointed at his chest.