but at the last when the month of may was drawing near the captains of the west set out again ; and they went aboard ship with all their men , and they sailed from cair andros down anduin to osgiliath ; and there they remained for one day ; and the day after they came to the green fields of the pelennor and saw again the white towers under tall mindolluin , the city of the men of gondor , last memory of westernesse , that had passed through the darkness and fire to a new day .