This report, addressed to the Hon. Jefferson Davis, Secretary of War, provides a detailed analysis of the effects of firing heavy ordnance from casement embrasures, as well as the effects of firing against the same embrasures with various kinds of missiles. Drawing on extensive testing and experimentation, the author provides valuable insights into the dynamics of siege warfare and the challenges faced by defenders of fortified positions. This book is a must-read for military historians and enthusiasts alike.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.