Nachtigall Battalion
The Nachtigall Battalion, officially known as Special Group Nachtigall, and the Roland Battalion, officially known as Special Group Roland, were the subunits under command of the "Abwehr" special operation unit Brandenburgers (1st Brandenberg Battalion). They were the two military units formed 25 February 1941 by head of the "Abwehr" Wilhelm Franz Canaris, which sanctioned the creation of the "Ukrainian Legion" under German command. They were manned primarily by occupied Polish citizens of Ukrainian ethnicity directed to unit by Bandera's OUN orders.