The sentences that contain sarcasm in the passage are:
- "No, you didn't expect him to get killed," Mrs. Gearson repeated, in a voice which was startlingly like George's again. "You just expected him to kill some one else, some of those foreigners, that weren't there because they had any say about it, but because they had to be there, poor wretches--conscripts, or whatever they call 'em."
- "You thought it would be all right for my George, your George, to kill the sons of those miserable mothers and the husbands of those girls that you would never see the faces of."
- "I thank my God he didn't live to do it! I thank my God they killed him first, and that he ain't livin' with their blood on his hands!"
These sentences express a tone of bitterness and disdain, highlighting the irony and moral outrage Mrs. Gearson feels towards Editha's expectations about war and heroism.