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Well for a siege af course you do need a big army, certainly considering it must have beaten all reiforcements that Gondor send to defend Minas Ithil, which af course if it was a massive siege would have happened. Now after being beaten a few deccenia ago, the Witch King could not have gotten a army big enough to lay a siege upon Minas Ithil, it was simply immpossible.
But af course it isn't immpossible that they have taken Minas Ithil, as explained in other posts they could have well taken Minas Ithil by haunting or something simulair.
Now that leaves us with 2 options, or Tolkien misused the term 'Siege' or this is one of his very few mistakes/ subject he hadn't thought through.
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