Super-heavy naval guns would devastate fixed shore targets

What would battleships armed with 20- or 24-inch guns be like in shore bombardment?

They would be devastating against fixed positions and concentrated armour, although 16-inch naval gunfire was already capable of that mission.

Against fixed land targets, the accuracy problem is easier than it is against a manoeuvring warship. Twenty- or 24-inch guns could flatten major shore positions and make narrow defiles or bridges extraordinarily dangerous for armoured units. A tank need not take a direct hit because the blast and mass of a super-heavy shell landing nearby would be destructive. Existing 16-inch naval fire was already powerful enough for this mission, with the larger calibres increasing its effects.