It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: The Hour will not be established until you fight the Turks, whose faces will be red, noses flat, eyes small, and their faces will be like flat shields.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10861