Upwards of 230 citations are made of "Battle incidents," and, as an example of the Author's methods, attention may perhaps be directed to the reinforcement of the Text-book Principle of co-operation and mutual support by the citation of an instance, on the grand {viii} scale, by Army Corps (during the _First Battle of the Marne_), and on the minor scale, by tanks, bombers, aircraft, and riflemen (during the _First Battle of the Somme_); to the successful application of established Principles by the Advanced Guard Commander at _Nachod_, and to the neglect of those Principles by "Jeb" Stuart at _Evelington Heights_, and by the Prussian Advanced Guard Commanders in 1870; and to the value of Musketry Training by instancing the successes achieved at the _Heights of Abraham_, at _Bunker Hill_, _Coruna_, and at _Fredericksburg_, which were repeated during the _Retreat from Mons_ and at the _Second Battle of the Somme_. While every effort has been made to achieve accuracy in citation, and to avoid ambiguity or error in the enunciation of Principles, the Author will be very grateful if his readers will notify to him (at the address of the Publishers) any inaccuracies or omissions which may come under their notice. LONDON, March, 1922. {ix} TABLE OF CONTENTS PAGES CHRONOLOGICAL LIST OF BATTLES CITED . . . . . . . . . . . . . xv-xvii PUBLICATIONS CITED IN THE LECTURES . . . . . . . . . . . . . . xix THE ART OF WARFARE . . . . . . . . . . . . . . . . . . . . . . 1-5 Principles of War--Popular fallacies--Authorities quoted in support of Fixed Principles (Gen. B. Taylor, C. S. Army; Marshal Foch; Marshal Haig)--Necessity for Study (Gen. Sir E. B. Hamley; Marshal French; Marshal Foch; Napoleon)--"Common Sense" (Abraham Lincoln and Jefferson Davis; General Grant)--"Higher Ranks" Fallacy (Col. Henderson; Gen. Sir E. B. Hamley)--Necessity for Study proved (Col. Henderson). STRATEGY AND TACTICS . . . . . . . . . . . . . . . . . . . . . 6-23