The Return of the King: Being the Third Part of the Lord of the Rings · Chapter 12
Sam Rescues Frodo
Sam enters the Tower of Cirith Ungol using the Phial to pass the Watchers. He finds Frodo stripped and beaten, frees him, and returns the Ring. Together they escape as a Nazgûl arrives and the Watchers' arch collapses.
Outcome
Frodo and Sam are reunited; they don orc disguises and continue toward Mount Doom; their bond deepens through trial.