It was created on April 1 , 1937 , out of former 1st Cavalry Brigade .
Mazowiecka Cavalry Brigade ( Polish : Mazowiecka Brygada Kawalerii ) was a cavalry unit of the Polish Army in the interbellum period , which took part in the Polish September Campaign .
Mazowiecka Cavalry Brigade was created on April 1 , 1937 , out of former 1st Cavalry Brigade .
Mazowiecka Cavalry Brigade ( Polish : Mazowiecka Brygada Kawalerii ) was a cavalry unit of the Polish Army in the interbellum period , which took part in the Polish September Campaign .