High Quality Content by WIKIPEDIA articles! The Sub-district VII of Warsaw suburbs (of Armia Krajowa) (Polish: Obwód VII Warszawa podmiejska) also called Sub-district collar (Polish: Obwód Obro?a)- a territorial organisational unit of the District of Warsaw of Armia Krajowa, which acted during the German occupation of Poland. Military units of that sub-district took part in the Warsaw Uprising of 1944.The sub-district operated since 1940 and covered the area of the then powiat of Warsaw, excluding the city area of Warsaw itself. During the whole period of German occupation the chief of the sub-district was major Kazimierz Krzy?ak pseudonym Bronis?aw or Kalwin.