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Well I am going to say it is the battle trees because it led to old strongholds / territory being regained. The elves reagained their old lands in Southern Mirkwood. But the others involved the loss/ destruction of stronghoilds/territory.... Gondolin self evidently, Awakening of the Balrog meant the Dwarves had to leave Moria (and many elves fled Lorien), the fortresses of Angrod and Aegnor and Maglor's Gap were lost during the battle of Sudden Flame...
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