 The Podlaska Cavalry Brigade ( Polish : Podlaska Brygada <unk> ) was a military unit of the Polish Army , created on April 1 , 1937 . Its headquarters was located in Białystok and operated as part of Independent Operational Group Narew . It was formed from the Cavalry Brigade " Białystok " , which existed between February 1929 , and March 30 , 1937 . After the Soviet invasion of Poland , remnants of the Brigade fought both Wehrmacht and Red Army troops , capitulating on October 6 , 1939 . 
