I somehow feel like I'm falling into a trap when I say this..
In 457 FA, Sauron took Minas Tirith (and most likely broke its gate). But you were most likely referring to the Battle of Pelennor Fields in 3018 TA in which Grond under the command of the Witch King was hurled thrice against the gate of Minas Tirith by great mountain trolls.
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'They say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end."
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