In Gone With the Wind why does Rhett Butler join the Confederate Army when the war is almost over?

Rhett Butler joins the Confederate Army near the end of the Civil War primarily out of a sense of duty and to support the South, despite his previous cynicism about the war. His enlistment reflects a complex mix of personal honor and a desire to be with Scarlett O'Hara, who is deeply invested in the Confederate cause. Additionally, his decision underscores his rebellious nature and unwillingness to conform to societal expectations, even as the outcome of the war becomes increasingly bleak.