The Nachtigall Battalion (English: Nightingale Battalion), also known as Ukrainian Nightingale Battalion Group (German: Bataillon Ukrainische Gruppe Nachtigall), officially known as Special Group Nachtigall, was the subunit under command of the Abwehr special operation unit Lehrregiment "Brandenburg" z.b.V. 800. Along with the Roland Battalion it was one of two military units formed February 25, 1941 by head of the Abwehr Wilhelm Franz Canaris, which sanctioned the creation of the "Ukrainian Legion" under German command. It was manned primarily by occupied Poland citizens of Ukrainian ethnicity directed to unit by Bandera's OUN orders.
In Germany, in November 1941 the Ukrainian personnel of the Legion was reorganized into the 201st Schutzmannschaft Battalion. It numbered 650 persons which served for one year at Belarus before disbanding.
Many of its members, especially the commanding officers, went on to the Ukrainian Insurgent Army and 14 of its members joined SS-Freiwilligen-Schützen-Division «Galizien» in spring 1943.
Read more about Nachtigall Battalion: Formation and Training, War With The Soviet Union, Assessment, Controversy