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Good question
If Gandalf and Erkenbrand wouldn't of arrived when they did I believe Helm's deep would of fallen, but then would of been killed. To explain, you had Theoden, Legolas, Aragorn, and probably a few others, when Theoden decided to ride out and meet them. Gimli, Eomer and his men were still fighting in the caves I believe. So if Gandalf wouldn't of come when he did Theoden and all who rode out probably would of been killed along with Eomer and Gimli. But then you have Gandalf and company arriving and the Huorns guarding the forest so they wouldn't of gone far.
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