Why India could not defend against foreign invasions in the past centuries, is an open question on the minds of most compatriots. This book is about how and why all this subjugation transpired. The analysis begins with Volume-I that begins with the Ancient Period and recounts the events of Islamic Ascension and the reasons for failure of the indigenous powers to defend. The total appraisal relating to how the ancient Bharata Varsha was transmogrified into Hindustan during the Medieval Period and then to India, is accomplished in five volumes. The causes of our incapacity to defend and repel the invaders are intently explored, which then become Lessons for the Future. This land had achieved the lofty heights of greatness in learning, philosophy, and sciences, among its peers of the ancient world. But then, somewhere in the swirling mist of time, it lost its way and by the time it became Hindustan, during the Medieval Period, it was shorn of all that plumage of greatness and majesty and rendered feeble and vulnerable to onslaught. It was sacked, plundered, and pillaged for centuries and its temporal and intellectual wealth was carried away to far off lands by invaders who came to own this land.