How did the relations between muslims and Europeans affect philosophy in the middle ages

The crusades where a religious war from the 11th to the 13th century where the Christian Europeans tried to take the Holy City, Jerusalem, where Muslims had power. The Europeans were more into converting the Muslims and taking the holy city then learning about the Islamic culture. Before the crusades how ever Islam had spread across North Africa and Up into Spain which was taken over by the Moores from Morroco. Hundreds of years before it was Constantinople where a lot of the works of Aristotle were. Aristotle had studied a theory of logic called Dialectic. Dialectics is basically an argument in which although the two sides don't end in agreement they still learn something. The Europeans did not have knowledge of this theory just yet and so they were not working to much with philosophy while they were trying to rise back up after the crusades were over. The bad relations between the Muslims and Europeans kept valuable information from the Europeans and when the Europeans gained this information they went into the 12 century renaissance.
citation:
Munqidh, Usmah Ibn. "Muslim and Christian Piety in the 13th Century." Internet Archive: Wayback Machine. Fordham Edu. Web. 27 Apr. 2010. .
"Dialectic." Wikipedia, the Free Encyclopedia. Web. 27 Apr. 2010. .
Lightbulb. Digital image. Commons.wikimedia. Wikipedia. Web. 27 Apr. 2010. .