Paul Revere's Ride, from the poem:    Listen, my children, and you shall hear Of the midnight ride of Paul Revere, On the eighteenth of April, in Seventy-Five: Hardly a man is now alive  Who remembers that famous day and year. He said to his friend, “If the British march By land or sea from the town to-night, Hang a lantern aloft in the belfry-arch Of the North-Church-tower, as a signal-light,— One if by land, and two if by sea; And I on the opposite shore will be, Ready to ride and spread the alarm Through every Middlesex village and farm, For the country-folk to be up and to arm.” and there's more but this should answer your question.