Although it's not found anywhere in published texts that I recall, the orc-army that invaded Rohan was in fact the one which had attacked Lorien and been repulsed, so it turned southwards over the Limlight instead. I suppose one could speculate that an army based on Dol Guldur was "second-line" compared to those of Mordor.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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