The main theme of this poem is to avoid wars and to bring peace among nations. this poem described in the background of the Vietnamese war. this brings to the readers notice about the agony experienced by soldiers. the soldiers are most likely to be affected by PTSD-post traumatic stress disorder. this poem tell us the experiences of a soldier , who fought hard and is now feeling guilty as he cannot move on because of the "small pain in his chest". he also gives reasons as to why he was feeling tired or worn out. he asks for a sip of water and then , feels a bit better , but then again feels guilty at the thought of his family. as , he wanted to take a little rest before moving on , he ended up resting eternally. this poem is very sentimental in the last. the poet is very touched as he was unable to do anything to help this dying soldier.