Alauddin Khilji needed a large and efficient army to defend against frequent Mongol invasions and to support his expansionist policies. To maintain such a force without burdening the treasury excessively through traditional land grants (iqtas) to soldiers, he introduced market control measures to keep prices low and paid soldiers in cash salaries. He also introduced the system of 'dagh' (branding of horses) and 'chehra' (description roll of soldiers) to prevent corruption and ensure quality and strength of the army.