Mahmud's invasions alone meant to the country' a loss of about two million people.... Bakhtiyar Khalji marched through Bihar into Bengal and massacre… - K. S. Lal

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Mahmud's invasions alone meant to the country' a loss of about two million people.... Bakhtiyar Khalji marched through Bihar into Bengal and massacred people in both the regions. During his expedition to Gwalior Iltutmish (1210-36) massacred 700 persons besides those killed in the battle on both sides. His attacks on Malwa (VMisha and Ujjain) were met with stiff resistance and were accompanied by great loss of life. He is also credited with killing 12,000 Khokhars (Gakkhars) during Aibak's reign. The successor of XhutmisK (Raziyah, Bahrain etc.,) too fought and killed zealously.