IF, you were able to get the catapult aimed at the charge and it is on a narrow path/slope whatever, than it would definately disrupt the charge. I just don't see that happening very well though. Again the rate of fire would only allow one shot to be placed but if you could do it just right it would be great. Multiple catapults launched at a larged charge with multiple volleys of arrow would be a bit different but each catapult again would only get one shot and the aim would need to be on.
Arrows aimed at horses would be your best quick defense which is obviously what the orcs needed in this situation.
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“I wish it need not have happened in my time," said Frodo.
"So do I," said Gandalf, "and so do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given us.”
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