What Triggered the Viking Raids Into Francia?

There's no one single spark or event that caused the vikings to suddenly make their way into francia. A various different factors would have converged for these groups of e to make their way south. And combine this then with the growing awareness of the wealth that was available in francia, and you have very distinct sort of push and pull factors. Early attacks taking place on the areas of frisia, which corresponded to the coastal region of the netherlands - northwestern germany.