The Pratihar Rajput Empire acted as a barrier for Arab invaders from the 6th to the 11th century. The chief accomplishment of the Pratihars lies in its successful resistance to foreign invasions from the west, starting in the days of Junaid. Umayyad campaigns in India (740) An alliance of rulers under Nagabhata I defeated the Arabs in 711 CE, and forced them to retreat to Sindh. Historian R. C. Majumdar says that this was openly acknowledged by the Arab writers. He further notes that historians of India have wondered at the slow progress of Muslim invaders in India, as compared with their rapid advance in other parts of the world. Now there seems little doubt that it was the power of the Pratihara army that effectively barred the progress of the Arabs beyond the confines of Sindh, their only conquest for nearly 300 years.