"All the nations of the Franks trembled at that terrible army, and they betook them to their king Caldus (Charles Martel), and told him of the havoc made by the Moslem horsemen, and bow they rode at their will through all the land of Narbonne, Toulouse, and Bordeaux, and they told the king of the death of their count." — Anon Arab Chronicler This passage is discussing
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It's a passage from the Muslim perspective describing the Battle of Tours where Charles Martel turned the tide of their advance into Europe. This is the relevant document:
As for what it is discussing, take a closer look at the language being used - "the Franks trembled at that terrible army" and that they later went to tell Charles Martel about what they were seeing.
What were they seeing? What made the Franks so scared that they went to their king to ask for aid? It goes on to describe how the Muslim army "rode at their will through all the land." What does that tell you about the Muslim armies that are threatening Europe? Were they weak - or were they unstoppable? When you have that answer, you'll know what the passage is trying to describe and how the Europeans saw the Muslim invasion.