The Einsatzgruppen kept official records of many of their massacres and provided detailed reports to their superiors. The Jäger Report, filed by Commander SS-Standartenführer Karl Jäger on 1 December 1941 to his superior, Stahlecker (head of Einsatzgruppe A), covers the activities of Einsatzkommando III in Lithuania over the five-month period from 2 July 1941 to 25 November 1941.[138]