Read this excerpt from “a horseman in the sky” by ambrose bierce. which sentence or phrase in the passage reveals how the father feels about his son’s decision to join the union army?

Well, go, sir, and whatever may occur do what you conceive to be your duty. Virginia, to which you are a traitor, must get on without you. Should we both live to the end of the war, we will speak further of the matter. Your mother, as the physician has informed you, is in a most critical condition; at the best she cannot be with us longer than a few weeks, but that time is precious. It would be better not to disturb her.”  

So Carter Druse, bowing reverently to his father, who returned the salute with a stately courtesy that masked a breaking heart, left the home of his childhood to go soldiering. By conscience and courage, by deeds of devotion and daring, he soon commended himself to his fellows and his officers; and it was to these qualities and to some knowledge of the country that he owed his selection for his present perilous duty at the extreme outpost.

- "the die is cast; i have consented to return if we are not destroyed. thus are my hopes blasted by cowardice and indecision; i come back ignorant and disappointed. it requires more philosophy than i possess to bear this injustice with patience. i have lost my hopes of utility and glory; i have lost my friend."