The Wehrmacht's aggressive rear security doctrine, and the use of the "security threat" to disguise genocidal policies, resulted in close cooperation between the army and the security apparatus behind the front lines during Operation Barbarossa, the 1941 German invasion of the Soviet Union. Schenckendorff organised a three-day field conference in Mogilev to create an "exchange of experiences" for the Wehrmacht rear unit commanders.[1] Participating officers were selected on the basis of their "achievements and experiences" in security operations already undertaken; participants included representatives of the Army High Command and Army Group Centre.[2]