The French translation from Latin http://remacle.org/bloodwolf/historiens/anonyme/annales.htm [859] says:
> Les Danois dévastent les pays au-delà de l'Escaut. Le commun peuple des pays entre Seine et Loire, conjuré entre soi, résiste courageusement aux Danois établis sur la Seine ; mais sa conjuration étant conduite sans prudence, il est facilement défait par nos grands.
Which I would translate (using some true-to-heart adaptation given author period) by:
Danes (norsemen) raid country further the Escaut (probably that river in the north). Commoners from between Seine et Loire (in the center so), which were seceding at the time (secede is way too modern but best bears the sense IMO), bravely resist to Danes camping by the Seine; this secession however being lead without much thought, is easily defeated by our rulers (kings or dukes I'd say, and probably over months).
These annals are telegraph styled, written by multiple authors, etc. They are kind of notes. Yet they are one of the best material over this period of French history :)