In his prizewinning Mountain Fires: The Red Army's Three-Year War in South China, 1934-1938, Gregor Benton traced the fate of the Communist rear guard that stayed behind when the Red Army set off on the Long March. After three bloody years, the survivors regrouped as the New Fourth Army, which later helped to drive the Nationalists from the mainland. In this sequel to Mountain Fires, Benton describes the first three years of this army, and its triangular war with the Nationalists and the Japanese.

Like the Three-Year War from which it stemmed, the New Fourth Army was for...