Stumbling Colossus:

Drawing on evidence never before seen in the West, including combat records of early engagements, David Glantz claims that in 1941 the Red Army was poorly trained, inadequately equipped, ineptly organized, and consequently incapable of engaging in large-scale military campaigns - and both Hitler and Stalin knew it. He provides a complete and convincing study of why the Soviets almost lost the war that summer, dispelling many of the myths about the Red Army that have persisted since the war and soundly refuting Viktor Suvorov's controversial thesis that Stalin was planning a preemptive strike against Germany.