One time, I heard that in fact the iberian peninsula was not "exactly" invaded by the arabs.
They said that only around 300.000 / 400.000 arabs entered in iberian peninsula and there is no chance that they could rule over a population of 20 million iberians.

They said that fact was that islam was accepted by most of the population and that's how they avoid most of the blood.

War looking for peace,
is like fornication looking for virginity.