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Why not a 2 year siege? because all the armies the Witch King gathered were destroyed by a fractions of the Gondorian armie 30 years ago... no matter how small that pass is, Minas Ithil is a big city, and it seems very unlogical that the Witch King can get a army big enough to defeat Gondor, because why would he then have not gathered that troops in Angmar?
And about the motivation, Minas Ithil is still locatted on the Gondorian side of the mountains, it is defintly Gondor, and no matter how much it is on Gondor's border, it was a major city, it just wouldn't make sence that Gondor would just do practicly nothing to keep one of their major settlements...
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