Answer: It conveys the speaker's feeling of powerlessness.
Explanation: In his poem Dulce et Decorum Est, Wilfred Owen paints a disturbingly clear and realistic picture of war, effectively taking all glamour from it: a first-person account of a soldier who sees how one of his mates, who could not put on his gas mask in time, dies a horrible death caused by chemical weapons, an experient that haunts him to this day.