Well, he didn't plan to stay (at least, not yet that time around) by what I've read of it. So aside from good old-fashioned raiding and pillaging and obliterating a few armies and razing some towns his little sightseeing trip could presumably be termed just that.

Pretty much the normal method of going about new conquests too by what I've read. Hit the place hard enough and often enough that the resistance weakens sufficiently for proper takeover. Sounds like a solid plan to me...