I have not check the link yet but artillery are not very effefctive from distance. Due to the accuracy problem, it can shoot many shells before it hit a target. But basically if ship are equipped with many artillery cannon it would be easier.
For small gun like the 20mm it would have not any problem to shoot since its range is not very far. But you know it depends also on the wind and the weathers, it would be useless to attack at a rainy days
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