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Building a giant cannon is not a matter of simply increasing the size of the gun in a crude, straightforward manner.

As the shell grows larger, the amount of propellant required naturally increases as well. And as the amount of propellant increases, so does the force of the explosion.

That was because the amount of propellant required did not increase proportionally with the caliber.

Firing the 406mm guns of the battleship Albion requires six 22.7-kilogram propellant bags, or about 140 kilograms in total.

However, firing a single round from the Gustav railway gun requires a staggering 1,850–1,990 kilograms of propellant.

Although the caliber had only doubled, the amount of propellant had increased more than tenfold. With the North's backward steelmaking technology, it was impossible to produce a barrel capable of withstanding such tremendous explosive force.

A gun barrel was not something that only had to withstand the impact once. Cannons were weapons that reduced their margin of error through repeated firing.

Thus, when they first encountered the railway gun aiming at the defensive line from a distance of 25 kilometers,

the soldiers defending the line could do nothing but doubt their own eyes.

"W-What is that?"...