 Mikhail Polikarpov, a historian and participant in the war, numbered Russian soldiers at the hundreds, about 40 of whom died and 20 injured.These Greek and Russian mercenaries fought for some 200 German marks monthly.Primary Russian forces consisted of two organized units known as ""РДО-1"" and ""РДО-2"" (РДО stands for "Русский Добровольческий Отряд", which means "Russian Volunteer Unit"), commanded by Yuriy Belyayev and Alexander Zagrebov, respectively.