This is Charlie's second battle. In this battle, Charlie is surprised that he is acting like an animal, who wants to just kill. Charlie is also surprised that he cries whenever he sees anyone die, even if he dint knows them.
This is the third battle that Charlie participates in he thinks he is shot and goes to the surgeon's tent. It turns out that he was covered in somebody elses blood. While at the tent Charlie helps build a wall of dead bodies, to protect from the wind.
The Battle of Gettysburg. This is the deadliest and the last battle that Charlie participates in.