Independent Operational Group Narew

Forces as of 31 August and German plan of attack.
Forces as of 14 September with troop movements up to this date.
Forces after 14 September with troop movements after this date

Independent Operational Group Narew (Samodzielna Grupa Operacyjna Narew, SGO Narew) was one of the Polish Army Corps (Operational Groups) that defended Poland during the Invasion of Poland in 1939. It was created on 23 March 1939 and was commanded by general Czesław Młot-Fijałkowski.