I doubt it. Cavalry units were used in mass scale in the war with Soviet Union in 1919/1920. But in 1939 cavalry and horses in general were used for fast transportation. If you allude to the supposed attacks of "stupid" Polish cavalry against German tanks be warned that it was a fabrication of Nazi propaganda mindlessly repeated in Western media. Do not trust media or "official" version of history, please. Investigate carefuly first.