I want to know the answer to the following question:
The Abbasid army replaced Iranian and Arabic men with Turkic tribesmen as what element in their army?
All the background I'm provided with is that "In 999, large portions of Iran came briefly under the rule of the Ghaznavids, whose rulers were of mamluk Turk origin, and longer subsequently under the Turkish Seljuk and Khwarezmian empires.". Is that enough to answer the question?