The word "interface" does not belong in well-written text, let alone the title of a book, but that should not deter potential readers. Some of the United States' finest military historians -- John Guilmartin, Dennis Showalter, Robert Utley, and Douglas Porch -- have contributed essays to this book. Divided into sections of several essays each on pre-modern armies, Western forces and indigenous peoples, and twentieth-century clashes between colonial armies and the people they confronted, the book rewards a careful browsing. Without quite admitting it, the volume deals not with conflicts between cultures per se, but between what used to be regarded as advanced or developed civilizations and those that were not. That understood, the book has more coherence than most edited collections, and some of its individual essays are outstanding.