 When Frodo and Sam are brought to the cave, they are told that Boromirs   cloven horn was found. Faramir then remembers a dream of Boromirs funeral   boat passing him on the river. This leads to an extended flashback of   Boromir and Farmair reclaiming Osgiliath from Mordor. Denethor (their   father) expresses his disappointment with Faramir and then sends Boromir to   Rivendell to claim the Ring. 