Independent Operational Group Narew

It was created on 23 March 1939 and was commanded by general Czesław Młot-Fijałkowski.

The SGO Narew was defeated in the battle of Zambrów on 6 September, with the 18th Infantry Division being mostly destroyed.

The remaining units retreated to Puszcza Białowieska large forest complex, and were later incorporated into Independent Operational Group Polesie.

[2] It consisted of 2 infantry divisions and 2 cavalry brigades:[1] Air Units attached to SGO Narew:

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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