After the German attack on the Soviet Union in June 1941, the district of Białystok, which included the Białystok, Bielsk Podlaski, Grajewo, Łomża, Sokółka, Volkovysk, and Grodno Counties, was attached to (not incorporated into) East Prussia. Other Polish territories, first annexed by Soviet Union and then by Germany, was incorporated into Reichskommissariat Ostland (in the north), Reichskommissariat Ukraine (in the south) and the General Government (Distrikt Galizien in the utmost south).