could the easterling breach erebor?

[tom the eldest]

Isnt iron hills dont have a sizable number of dwarves anymore since the refounding of erebor?im pretty sure that it has become obscure since erebor was refounded.as for catapult,they could get it from sauron,and that catapult could add some firepower,because its able to throw high enough to bypass minas tirith's first wall,which is very high,while at the same time remain out of range from gondorian machine in the wall.