The Captain is the narrator, and we can see by his actions, and what he says, that he is unsure of himself. At only 27 he is in charge of a group of men older and more experienced than he is. Because of this, he is constantly questioning and judging his own thoughts and actions. He did not know himself well, which is why he says, "I was something of a stranger to myself." Through his identification and eventually understating with Leggett, the Captain gets to know himself much better, and is no longer a stranger to himself.