You do know that Mecca was beseiged by the Ummayad Caliph Yazid I in 683 and I think the Kaba was even hit by a catapult (interestingly enough, Muslim jurists or the middle ages debated on whether using a catapult was allowed, which may have had something to do with the issue of killing women and children, but this would also be on their minds I would guess).
As if that wasn't enough, the Fatimids (who are Ismaili and considered non-Muslim by most Muslims) sacked the city around 930.
One last time was the Wahhabi uprising against the Ottomans in 1803.
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