I'm such an idiot, misunderstood what you asked.... okay, so I'm currently uploading the saves.
Before siege save is straight forward.
After Siege 1: In this save, we only had the battering ram, I stood around, just protected myself, and didn't do anything. The soldiers pushed the ram to the gate, started breaking in, and in that moment, the rest started using the ladders.
After Siege 2: In this save, the lord built a Siege tower as well. The ram got pushed, the tower got pushed, but they were just eying the ladders. I ran up to a ladder, started putting it up (got killed in the process) but suddenly, the soldiers decided that the ladders could be used, rushed them, then slowly, one by one started assaulting the walls on them.
After Siege 3: In this save, the lord again, built only a ram. This time, I saw the popup, "Infantry and Infantry are waiting for siege machines", and below that "Infantry using siege machines". They started pushing the ram, but the rest just stood around. (except the archers, they were shooting and hiding) I ran up to a ladder, started prepping it up, and everyone decided to rush the ladders (all four of them), and put them up. After that, they went up one by one.
I will try using the same save, but with the mods applied. Will upload an after siege save of that one as well.