Well, the chinese big secret was silk. So that would be my best guess.
You're suppose to ask a question... but that's very nice! :D
Answer:
The Vandals launched a massive invasion of Gaul in 406, and in the ensuing decades the Franks took advantage of the overstrained Roman defenses. ... He then took advantage of the disintegration of the Roman Empire and led the united Franks in a series of campaigns that brought all of northern Gaul under his rule by 494.
Explanation: