G. A. Henty 
Young Colonists / A Story of the Zulu and Boer Wars [EPUB ebook] 

PREFACE: "As a rule the minor wars in which this country has been from time to time engaged, have been remarkable both for the admirable way in which they were conducted and for the success that attended them. The two campaigns in South Africa, however, that followed each other with but a brief interval, were notable exceptions. In the Zulu war the blunder, made by the General in command, of dividing his army and marching away with the greater portion without troubling himself to keep up communication with the force left behind, brought about a serious disaster at Isandula."