I would go with a barge, even a motor powered barge to allow it to move slowly or manuver to counter the current and mount a couple batteries of mortars or even rocket launchers which are actualy easier to make than a canon, its easy to make a rail and tube for a rocket, and the rocket is pretty simple to make. So, you have a built in set of rails with a few dozen tubes to fire which would lay waste to the target area.
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