A couple of comments based on what I have gleaned over the years.
-The Poles had recently purchased a number of Bofors towed AA guns and new 37mm AT guns and had issued at least some of these, so to say that they had only a few obsolete weapons of this type is probably not correct. As well as these systems, they made use of anti-armour capable weapons mounted in prepared fortifications (but not enough and not in the right places) and armoured trains. Before we laugh at the trains, I recall reading of at least one engagement in which a train (and its integral rail-carried tanks) successfully drove off a panzer assault, as the train had heavier armour and bigger guns than the German panzers. So, the Poles were also capable of improvisation against tanks;
-Polish cavalry still carried the designations "Lancers", "Uhlans", etc but to a great extent they were trained as mounted infantry. And, let's not forget, the Red Army made successful use of cavalry formations up to Corps size all through the war;
-to say that the Poles did not understand the "military art" is IMHO a strange statement: their performance in the Russo-Polish war alone, especially their last-ditch defeat of the Red Army in front of Warsaw, should discount that statement. Faced with the German onslaught, the Polish Army did not fall apart at the tactical level: it fought some very stubborn delays and withdrawals, and launched at least one operational-level counterattack west of Warsaw that scared the Germans quite badly (although they rallied and crushed it). Where things broke down (again IMHO) was at the operational/strategic level interface, as the national command and control system (based on civil telephone circuits) and the supporting infrastructure needed to fight a war, both collapsed when the Polish forces needed them most. This meant that the Poles could neither gather info nor implement decisions quicky at that level, and the ability to rapidly redeploy and sustain troops was lost. Against the Germans this was probably a guarantee of failure; and
-IIRC the Poles did not keep any significant forces deployed against the Russian border. They accepted a very heavy strategic risk in deploying all of their Armies and Operational Groups against the Germans, with a Reserve in the Warsaw region. As far as I can recall, all that was deployed in the East were a few battalions of infantry and cavalry belonging to the KOP, the frontier defence corps. IMHO there was no significant Polish resistance to the Red Army because there was nothing there to resist with.
Cheers
