The strategists in the Battle of Five Armies plan to lead the goblins between the spurs of the mountain unless they are so numerous as to overrun the Mountain.  Here we have both the spatial sense of running over the surface to cover it and the superiority sense of being most powerful.

• 17.045 to overrun the Mountain itself,

“overrun, v.” OED Online. Oxford University Press, June 2015. Web. 14 July 2015.