The Two Towers Book 3, Chapter 1
Aragorn looks everywhere for the two Hobbits. He hears screams and the voices of orcs. Then, suddenly, the horn of Boromir is sounded. He rushes to find Boromir pierced with many arrows. In his final breath, Boromir tells Aragorn that the orcs captured the hobbits and that it was his fault Frodo fled the company. Legolas the elf and Gimli the dwarf appear and ask if Boromir meant that ALL of the hobbits were captured or just Pippin and Merry. They search through the bodies of orcs and find nothing except for the sign of Saruman. They debate what they should do next and reason that before anything else, they should tend to Boromir's fallen body. From footprints and a missing boat, they discover that Sam and Frodo left together. They put Boromir's body in one boat and array it with the weapons of his fallen enemies. When this is done, Legolas and Aragorn each sing a song as the boat begins its journey down the river. The remaining members of the company are unsure whether they should look for Pippin and Merry or follow Frodo. Aragorn says, "'I will follow the orcs.'" Book 3, Chapter 1, pg. 25. He does not tell the others why Frodo ran from the group. They load up the boat and begin to follow the shore. Before long they find orc trails and begin to chase after them, knowing it will be a long journey.