Yes
I think that they would have won for the moment. The final charge of Theoden and Aragorn was a last ditch type effort and they succeeded in driving back the Uruk-hai, but I think that if the forest of Huorns and Erkenbrand hadn't taken care of the rest then they probably would have regrouped and attcked Helm's deep again. The Rohirrim might have been able to hold them up. I personally do not think that they could have.
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Yrch!
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