Who is relieving the other of his watch ? Is bernardo relieving francisco? Is francisco relieving bernardo?

What impact does the use of dashes have on the rhythmic structure of this poem? the dashes create imperfect rhyme that confuses the reader. the dashes create a slow rhythm that is pleasant for the reader. the dashes create a quick rhythm that confuses the reader. the dashes create a heightened rhythm that excites the reader.