Did they not also have help from the Mirkwood elves in the end? Besides the guards, there were probably spells. Remember, as "Lady of the Wood" Galadriel knew what trespassed in her realm and with her ring could keep it from Sauron's power. But that is an interesting question. It was said that he planned to devastate Rivendell by dragonfire, wouldn't Sauron have other forces to throw at Lorien? And wouldn't Lorien have been the better (and closer) target in the first place? But Galadriel was powerful in her own right even without the ring.
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