That is pain.

It's just as if a red-hot iron was being pushed through." "Can I get anything for you ?" I said.
"No," was the gruff reply; "unless you can get me a heap of patience to bear all this pain." I tried to say a few comforting words to him, but they only seemed to irritate.
"Don't," he said peevishly.

"I know you want to be kind, my lad; but I'm not myself now, and it only makes me feel mad.

There, thank ye for it all; but please go before I say something ungrateful." I crept away and tried to find the doctor who was with the corps; but he was busy with his wounded men, of whom he had about twenty.

Giving up the satisfaction of getting his report about the young Lieutenant, I went to where Sandho was picketed with the rest, and stood by his head for about half-an-hour, petting and caressing him, before going back towards the rough breastwork--partly natural, partly artificial--which served as a shelter from the bullets.
I soon came upon one of the sentries, who challenged me; but he made room for me beside him after a few words had passed.
"Oh yes," he said, "you can stay here if you like; but why don't you go and lie down till you have to relieve guard ?" "Because I feel too excited to sleep," I replied.
"Humph! Yes, it has been warm work," said the sentry; "but I suppose we shall get used to it.