His face was very grave, but Harry presently saw him smile a little.

He wondered, but he had learned enough of discipline now not to ask questions of his commanding officer.

At length he heard the colonel mutter: "It is Carrington! It surely must be Carrington!" A third battery now opened at a point almost midway between the other two, and the smile of the colonel came again, but now it lingered longer.
"It is bound to be Carrington!" he said.

"It cannot possibly be any other! That way of opening with a battery on one flank, then on the other, and then with a third midway between was always his, and the accuracy of aim is his, too! Heavens, what an artillery officer! I doubt whether there is such another in either army, or in the world! And he is better, too, than ever!" He caught Harry looking at him in wonder, and he smiled once more.
"A friend of mine commands the Northern artillery," he said.

"I have not seen him, of course, but he is making all the signs and using all the passwords.