Did Roman catapults knock down the walls of Carthage?

Or were they used for a different purpose?
The Bardo Museum displays artifacts found just a few kilometers away in the ruins of the ancient city of Carthage. For three years the mighty Roman army tried to breech the triple walls of Carthage, with no success. But in 146 BC, the Romans finally cracked the secret of getting past the walls - the result was one of the bloodiest sieges in history.
What was the one weapon that changed everything? And how are modern historians changing centuries held ideas about how it was really used?
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