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In page Reconquista:

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On the other hand, Christian armies sometimes forged temporary alliances with Islamic emirs, and Christian mercenaries were quite willing to fight for Arab and Berber rulers if the price was right.[2] El Cid is a well-known example of a Christian mercenary leader who was in paid military service of the Islamic kings of Zaragoza for years.[2] Mercenaries were an important factor, as many kings did not have enough soldiers available. Norsemen, Flemish spearmen, Frankish knights, Moorish mounted archers (archers who travelled on horseback), and Berber light cavalry were the main types of mercenaries available and used in the conflict.[citation needed]