As discussed by Legolas II Greenleaf at the Council of Elrond, Gollum had escaped from Thranduil's dungeons as there was a surprise attack on Mirkwood by the forces of Dol Guldur. This battle took place roughly around the same time as Mordor's first assault on Osgiliath shortly before the War of the Ring.
Attack on the Woodland Realm
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Date
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Sometime around June T.A. 3018
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Good Factions
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Evil Factions
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Good Characters
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Evil Characters
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Good Numbers
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No information
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Evil Numbers
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No information
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Victory
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Good but Gollum escaped.
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