In Chapter 21, why does the officer reproach the regiment? How does Henry respond to this criticism?

No firing threatens the regiment as they return to their blue lines. The men are nervous as they go, suspecting that they may be fired on at anytime. When they get back to their lines, they are peppered with sarcastic questions, asking where they have been and why they are coming back. The men of the regiment make no reply, except one soldier who challenges any one of them to a fistfight. Henry is stung by these remarks. He glowers at the men who ridicule him. He looks back at the ground they had covered, and it seems different.