The barbican was the fruit yielded from the wisdom of castle defense.
It was no problem for Kant to use it to build his own castle.
Only an indestructible castle could firmly occupy this desert. For example, the barbican and other fortifications with excellent defense thought could be built as much as possible.
The good defense system of the castle meant that the castle was safe, and the lord still had the right to control this place.
If it wasn't for the fact that the bastion was completely used for military purposes and couldn't take care of civilian life and regional development, Kant would have already built the walls of "Drondheim" Castle into the shape of a bastion.
After all, a bastion with all kinds of crossfire had a strong side even in the era of cold weapons.
It also had a good defensive effect against siege towers and other weapons.
But there was no other way.