I recently had a war which involved heavy use of Artillery and Offshore Bombardments. Unfortunately I got the above message so often I really had to question the use of this equipment at all.
Trying to be objective here - here's the Equipment I used:
Offshore Bombardments
Frigate - 95% bombard failed.
Ironclad - 75-80% bombard failed.
Destroyer - 100% bombard failed.
Artillery
H'wacha - 70-75% bombard failed.
Artillery - 50-55% bombard failed. 90% missing occupying units and damaging structures, population.
They were almost totally useless for knocking down defenders.
I remember my stack of 14 mixed Ironclads/Frigates bombarding for 2 solid turns and only getting a single successful hit
Artillery/bombards are useless unless they are in a huge huge stack it seems.
Trying to be objective here - here's the Equipment I used:
Offshore Bombardments
Frigate - 95% bombard failed.
Ironclad - 75-80% bombard failed.
Destroyer - 100% bombard failed.
Artillery
H'wacha - 70-75% bombard failed.
Artillery - 50-55% bombard failed. 90% missing occupying units and damaging structures, population.
They were almost totally useless for knocking down defenders.
I remember my stack of 14 mixed Ironclads/Frigates bombarding for 2 solid turns and only getting a single successful hit

Artillery/bombards are useless unless they are in a huge huge stack it seems.