No worries @oriskany. The invasion of Poland interests and holds my fascination, however the rest of the group are not interested in buying armies that use toys for tanks.  Sad really.

I have had a quick look through my library and unfortunately like your self I can only conform the 1st Cavalry Brigade as part of 3rd Corps,  Army Group North.

I did come across some supporting evidence for your idea that the German cavalry had been broken into small packets.

General Rundstedt commanding Army Group South far away from Army Group North was concerned about a Polish counter attack against his flank around 3rd Sept that never materialised.  To screen his flank security he ordered his cavalry units to take up positions.  Hitler intervened and ordered Rundstedt not to use his cavalry but use the 1st SS instead. Rundstedt concerned that the SS had no training as real soldiers and gave the job to the 30th Infantry Division instead.  So far I have not seen an Order of Battle that even mentions any cavalry attached to Army Group South.  Yet given that an infantry division was assigned the task Rundstedt cavalry must have been a sizable unit once they were combined for flank security for Army Group South.

Also I came across a mention that a number of Light Divisions were equipped with Pz-35Ts. Although starting to shown its age it was still a formidable tank in the Polish Campaign.  Unfortunately it made no mention of which Light Divisions were equipped with them. It would have been an interesting game to balance the 7TP in an encounter.

So hopefully this adds strength to what you were thinking.  🙂