Sri Aurobindo’s essays written on “War & Self-Determination” are briefly introduced in this small pocket book. How war becomes inevitable in the present state of consciousness of man can be understood. An invisible power which leads the human beings to their destiny is briefed. What constitutes the self-determination of the nations is discussed. The possibility of a league of Nations is also discussed (before the end of World-War I, i.e., during 1918). Though small, this booklet makes one to think about wars in the world and their possible solution.