Board Thread:Theories and Speculation/@comment-28136690-20160517141406/@comment-734582-20160517165731

Comic rider wrote: so does that mean his eyes were powerful enough to manipulate the moon and destroy entire armies with one hit? Yes. Though the moon at this point was mostly hollow.

But yea, even without Tenseigan, Hamura and Hagoromo had the power to move the moon itself (since that's what Six Paths Chibaku Tensei IS), and afterwards both basically gained the power to do it themselves.