However, the Ring soon betrayed him when it abandoned him during an ambush of Orcs at the Gladden Fields; Isildur was slain and the Ring was lost in the Anduin for a time.

Then Isildor plunged in and swam across, but the Ring betrayed him, (28) and slipped from his hand, and he became visible to his enemies; and they killed him with their arrows.

He knew that the Ring would only betray him, and that he had not, even if he put it on, the power to face the Morgul-king-not yet.

But the Ring betrayed him, as it slipped from his finger as he was escaping from an Orc ambush at the Gladden Fields.

There the Ring betrayed him and avenged its maker, for it slipped from his finger as he swam, and it was lost in the water.