
The speed at which you construct your siege camp and any siege weapons is based on your Engineering skill point total. This gives the defending forces a chance to build up their defences. You'll then begin the long process to constructing your siege camp, which must be done before developing any siege weapons. When you approach a settlement owned by an enemy faction that you are at war with, you will get the option to lay siege to that town. How to siege a town or castle in Bannerlord

In this Mount And Blade 2 Bannerlord siege guide, we will teach you how to lay siege to an enemy stronghold, as well as explain what each of the siege weapons do and when to assault.

Doing so is extremely risky without having ample supplies and a high enough skill point rating in engineering, and that's not counting other armies interfering in your plans. To get your own settlements in Mount And Blade 2 Bannerlord, the most direct way will be to lay siege to a town or castle.
