Historians of India, since the days of Eliphinstone, has wondered at slow progress of Muslim invaders in India compared to their rapid advance in other parts of the world. Arguments of doubtful validity have often been put forward to explain this unique phenomenon. Now there can be little doubt that it was the power of the Gurjara Pratihara army that effectively barred the progress of the Muslims beyond the confines of Sindh, their first conquest for nearly three hundred years. In the light of later events this might be regarded as the "chief contribution of the Gurjara Pratiharas to the history of India".