The Two Towers · Chapter 8
Victory at Helm's Deep

Saruman's vast host assaults Helm's Deep. The defenders fight desperately through the night until dawn brings salvation: Erkenbrand's forces, a mystical forest of Huorns, and Gandalf's triumphant return, routing the enemy.
Outcome
Saruman's army is destroyed; Théoden's resolve is forged in battle; the Rohirrim ride to confront Saruman at Isengard.