This is the English translation of a classic book on the subject of Jihad in Islam originally written and published in 1927 in the Urdu language by renowned scholar Sayyid Abul A'ala Maududi. A major part of the book deals with the comparative study of the concept of a just war in varíous theologies. This book covers various important events of World War I in great detail and provides a critical analysis of the conflict and post conflict development of international accords with respect to war.