Lectures on Land Warfare; A tactical Manual for the Use of Infantry OfficersAn Examination of the Principles Which Underlie the Art of Warfare, with Illustrations of the Principles by Examples Taken from Military History, from the Battle of Thermopylae, B.C. 480, to the Battle of the Sambre, November 1-11, 1918 by Anonymous
 is a Project Gutenberg book, now on Github.