The focus of this book is not to examine and assess Mahmud as a king or a statesman. Mahmud invaded India more than a dozen times. He introduced himself as a raider, an invader, and a military general. An effort has been made in this study to analyze, examine and evaluate the military actions of Mahmud from the point of view of his generalship. Mahmud was successful in all his campaigns. It is, therefore, important to find out as to what were the special techniques of battles employed by him. This is the main theme of this book and the succeeding chapters are merely an elaboration and elucidation of this theme.