This is an outstanding piece of scholarship, and is actually two books in one. The first "book" are the edited and translated works "Praecepta militaria" of Nikephoros II Phocas, and the "Taktika" (chapters 56 to 65) of Nikephoros Ouranos. The manuscript "Praecepta militaria" is very difficult to access for most scholars (its housed in Russia), and McGeer has done a great service for most byzantinists by editing and translating both manuscripts here. The make a good companion piece with "Three Byzantine Military Treatises" by George Dennis, and together offer a more detailed picture of the activities of Nikephoros II Phocas. The apparatus is extremely valuable, referencing other, older attempts at editing and research. McGeer also explains the paleographic difficulty in bringing these manuscripts to a wider audience, and the challenges of the orthographical irregularities throughout the texts. I find this work valuable for the fact that writings on Byzantine military art introduced a highly specialized vocabulary, which is challenging to translate. McGeer provides a glossary of terms transliterated into the Latin alphabet, along with the Greek index.
The second "book" is McGeer's historical commentary on the state of miltary art in the mid-tenth century. This is a fairly in depth examination of tactics and techniques used by the Byzantine army against the Muslims in Syria, and explains the success of Nikephoros II Phocas during his brief reign. McGeer also examines the armies of the Hamdanids and the Fatimids. Phocas reduced the Hamdanids to a client state, until the vacuum was filled by the Egyptian-based Fatimids. This historical analysis represents a significant advance in our understanding of the state of the Byzantine war machine in the mid-tenth century. The last comprehensive look at the reign of Nikephoros II Phocas was published almost a century ago, and the scholarship is dated.