An even greater number of people were enslaved as a part of the efforts of the Delhi Sultans to finance their expansion into new territories. For example, while he himself was still a military slave of the Ghurid Sultan Muizz u-Din, Qutb-ud-din Aybak (r. 1206–10 as the first of the Shamsi slave-kings) invaded Gujarat in 1197 and placed some 20,000 people in bondage. Roughly six years later, he enslaved an additional 50,000 people during his conquest of Kalinjar. Later in the 13th century, Balban's campaign in Ranthambore, reportedly defeated the Indian army and yielded "captives beyond computation".