it is basically people who don't live in a specific place(meaning they move around a lot) that hunt animals for food. if you are referring to people, cave dwellers are people who lived in caves
 
        
                    
             
        
        
        
Taking out American soldiers and replacing them with South Vietnamese soilders
        
                    
             
        
        
        
The battle you are referring to is actually called the Battle of the Ironclads. In this battle, it was the Merrimac (from the Confederacy) versus the USS Monitor (from the Union). This was the first battle between iron-fortified vessels in the Civil War. This battle ended up in a draw but represented a new form of fighting that both the Union and Confederacy had to be ready for. 
        
                    
             
        
        
        
Answer:
He just wanted to start over is my guess.. I mean he learned from that mistake. That is what life is about, learn from your mistakes and do better in life.