Is it possible that they suspected that, even if they were to retake Gundabad, the Orcs would simply return in a generation or two (as they did) and seize it from them again? "If this is victory, then our hands are too small to hold it." Even without a menace like the Balrog, perhaps the Dwarves knew that they simply didn't have the strength to hold Gundabad in the long term.
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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