LOTR: The Elven Archers Weren't At Helm's Deep In The Books, So Who Saved The Stronghold From Falling?

One of the most harrowing scenes throughout the Lord of the Rings trilogy is the Battle of Helm’s Deep. During the 2002 film adaptation of the Two Towers by Peter Jackson, the audience can see several brave members of the fellowship fighting in dire straits to protect the women and children hidden inside the tunnels below the keep. Alongside Gimli, Aragorn and Legolas, there is a host of elven archers and warriors led by the familiar face of Haldir of Lothlorien. But how is this scene different in the books?