To Salamaua, by Phillip Bradley; Cambridge University Press, 2010, 390 pages, $59.95. Phillip Bradley established a high reputation with his two earlier studies of important operations in the New Guinea fighting in the Second World War; they were On Shaggy Ridge and The Battle for Wau. His new book, To Salamaua, adds to his already substantial laurels. It cannot, for the author, have been an “easy write”, for the events spread themselves over a long slice of time and a broad swathe of country. They open in March 1942, when the Japanese invaders established for themselves powerful bases and…