Yes it does, but I always enjoy finding lines in the book that Jackson uses as an excuse to add something in. Gandalf's 'striking' of Denethor being one and, for example, a paragraph from TT in that it was stated
Quote:
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Out of the darkness arrows whistled. Swiftly a scout rode back and reported that wolf-riders were abroad in the valley, and that a host of Orcs and wild men were hurrying southward from the Fords of Isen and seemed to be making for Helm's Deep.
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and so he adds in the whole Warg Rider scene.