I am writing a siege battle that takes place on a fallen world. The defenders are behind a large steel reinforced wall (20m by 8m). The attackers, after suffering heavy losses, decided to bring in the big toys: “THE FORT BREAKER” (cooler name will be decided). The fort breaker is just a slightly bigger and more armored version of the Bagger 293 (see picture down below).
What I want to know is: Would this really take down a wall with people shooting at it or just add to the already high death count of the attackers?
To have a better understanding of the defenders' capabilities, it may help to read this question; it’s based on the same faction the defenders are. To sum it up: Firearms and combustible fuels are commonplace in society, but tactics are more tribal/feudal in nature (people can shoot and throw bombs at you but no one is pulling an RPG out of their pants