- The Captains of the West were foundering in a gathering sea.6.4 -- Book 6 Chapter 4 -- The Field of Cormallen (0% in)
- Out swept his sword, and he spurred to the standard, hewed staff and bearer; and the black serpent foundered.5.6 -- Book 5 Chapter 6 -- The Battle of the Pelennor Fields (9% in)
- 'Yes,' said Faramir, 'of the land of Westernesse that foundered and of the great dark wave climbing over the green lands and above the hills, and coming on, darkness unescapable.6.5 -- Book 6 Chapter 5 -- The Steward and the King (32% in)
There are no more uses of "founder" in The Return of the King.
Typical Usage (best examples)