How did charlemange expand his empire

He sought refuge on his enemies and destroyed any obstacles in his path, The expansion was made easier through manipulating others minds who disagreed with the expansion of empire.

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )