Smooth-bore cannons, accuracy was crap. Aim at the centre of the target and some of your broadside will inflict damage. Aim at the waterline and most will be stopped by the water.
In the US Civil War, Fort Pulaski was bombarded by them-thar new-fangled rifled cannons. They could reliably hit the same point every time. The walls were breached in 30 hours and the fort surrendered. Fortified strong-points became redundant overnight.
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