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They never did manage to win it as far as we know. In "The Changing Face of Evil", Bashir discussed possible tactics with which he hoped to win the battle--though they were quite generally shot down by O'Brien, who felt it just wouldn't be the same battle then. As that episode was very close to the end of the series when O'Brien left for Earth, it's unlikely that they managed to come up with a winning tactic and put it into place before then--the general feeling presented at the end was that they still had never won it.

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