The author is an eminent military scholar and this work, first published in 1976, still gives readers an accurate and comprehensive introduction to its subject. Chandler has a nice command of the English language, is thoroughly versed in the details and arcana of the technical aspects of the military art of the age he writes of, and places the subject of the book very adeptly into the context of the times, with appropriate nods to politics, economics, and the cultural ethos. He further offers good insights into the influence of the preceding era's style of warfare on that practised in the age of Marlborough, as well as giving an idea of the impact of Marlborough's period on the subsequent evolvement of warfare later in the 18th century.
As in any work of synthesis, Chandler's work cannot replace primal sources such as drill manuals, letters, diaries, memoirs, etc., from participants in the warfare he covers. Nor should it be read in expectation of giving a book-length treatment to any one battle or campaign -- Chandler is clearly painting with a broader brush in hope of giving us the big picture, albeit one that gives enough detail to stand magnified scrutiny.
Those who come to the subject via Chandler's work may well be intrigued enough to delve into more narrowly-oriented works on specific arms, units, battles or campaigns. Those whom want a good slice more of the reality of the age than the decent but very, very brief overviews offered by, say, the Osprey series cannot go wrong with either a used or reprint version of this book. Let those who cavil at its quality offer a list of more complete, accurate and pleasurable books covering the same topic in the same fine but broad manner.