In chapter 10 in The Red Badge of Courage why might the body be laughing?

In chapter 10 of The Red Badge of Courage, the body might be laughing as a result of a nervous reaction to the horrific events and stress of war. Laughter can be a coping mechanism to deal with fear, uncertainty, and the harsh realities of battle. It can be a way for the body to release tension and try to make sense of the chaos of war.