Imperial Russia went to war in the summer of 1914 with the largest air force among the Allied nations. And though the tempo of air combat on the Eastern Front never came to match that of the Western Front, the Russians came to see the value of having independent fighter units (AOI = Aviatsionniy Otryad Istrebitelei) and concentrating them along different sectors of the front, where, in addition to providing escort for aircraft engaged in bombing and reconnaisance duties, they could help to establish local air superiority in support of the Army.
This book offers a concise history of the various AOIs that were formed prior to the Bolshevik Revolution, as well as profiles on the 13 Russian pilots who were credited with downing at least 5 enemy aircraft, earning for themselves the title of "Ace." There are also lots of interesting photos of the fighter planes (many of them of foreign origin, for the Russian aviation industry proved unable to fully meet the needs of the Russian military, lacking a well-developed infrastructure for producing airplanes and their component parts) and the units who flew them. Any World War I air enthusiast will love this book.