Surely nobody who had suffered the ferocity of the Nazi invasion could consider switching sides and joining the Germans? Yet that is exactly what up to 400,000 Soviet citizens did in World War II.These included not only the 'legions' recruited from non-Russian ethnic groups eager for freedom from Stalin's dictatorship, but also some 100,000 Russians and Cossacks. What began as small local security units of 'Ostruppen', enrolled for the ongoing campaigns against Soviet partisans, were later reorganized, given special systems of uniform and insignia, amalgamated into larger formations, and eventually committed to the front line.This book is an essential guide to the appearance, formation and equipment of the myriad Russian and Soviet units that fought for the Germans. Featuring rare photographs and revealing colour illustrations, this is a peerless visual reference to the troops who switched from one ruthless superpower to another and met with a horrific fate when the fighting was over.