Gordon Williamson is a retired civil servant who spent several years working for the Royal Military Police (TA). He has written over 60 military books, including a number of titles for Osprey: ELI 183 U-boat Tactics in World War II, MAA 434 World War II German Police Units etc. Amongst his primary interests are the German Navy in World War II, U-Boats, and the Military Police forces of the Allied and Axis armies. He lives near Edinburgh in Scotland.

The security units of the Third Reich were many and diverse, yet often an oversimplified view is projected of these organisations. This title provides a detailed and informed picture of the variety of operations and duties, as well as the motivation and behaviour of the men involved. It charts the experiences of typical World War II security forces and police soldiers from the routine of military traffic duty, to combating partisans and resistance fighters. It covers the military police of the Armed Forces proper and the Waffen-SS, the combat units of the German State Police, the SD Sicherheitsdienst, the Schutzmannschaft' units, and the extreme and dreaded anti-partisan units 'Dirlewanger' and 'Kaminski'.