Read these lines from the poem. then he said, good-night! and with muffled oar silently rowed to the charlestown shore, just as the moon rose over the bay, what is the effect of describing how paul revere "silently rowed" with "muffled oar"? it foreshadows the quiet manner in which revere will warn of the british invasion. it provides necessary historical background for the poem. it introduces tension by stressing revere's effort to go unnoticed. it reveals what the british will do if revere is found.