"Do you understand that it’s more advantageous for the defending side in a siege?"

"Well, I guess."

Although the Grasis from my time was a kingdom on the verge of collapse, like a sandcastle on a wave, there was a time when it was a powerful and prosperous nation... or so I heard.

There was even a time when the Arka Empire had to tread carefully around it, though I find it hard to believe since I’ve seen it with my own eyes.

Anyway, if it’s not a lie, there were quite a few decent military strategy books and tactical manuals in Grasis.

What Edel just mentioned was a common point in those books.

"A fortress is essentially a structure built to defend against enemy invasions."