Answer:
He was happy for being small sized.
Explanation:
The narrator of "Drummer Man" is small sized. Based on the excerpt we can infer that he was not much happy with his small size. It was only one of two times when he liked being small sized.
His regiment had to retreat from a war front, but their Captain was wounded and left between the lines. Someone had to go there and drag Captain back to safe place. It was not easy for other soldiers to do it owing to their large size. The narrator because of being small in size did the job with not much difficulty. So he was happy for his small size.
A, I am deeply sorry if I am wrong, humanity make mistakes and I am part of humanity.
Where are the rest of them?
