In the picture: Polish infantrymen in late 1930s.

A piece of history: The Polish defence in 1939 plan to face up German invasion was completely imperfect. 1 000 000 men were ordered to fight the so-called border battle (bitwa graniczna) so as not to hand over western Polish land. It resulted from the fear that Germans could capture those lands and declare the end of the war. Such accomplished facts would be hopeless for Poland which economy was based on highly developed industry located in that part of the country. Performing such military plan, almost all the Polish armies were lost within 2 weeks of the combats just around border areas. As if it wasn't enough, Poles instead of defending cities and creating natural obstacles for German panzer units, were fighting with the enemy, mainly in open areas which resulted in heavy losses caused by German Luftwaffe and panzer division. No wonder that only 28 days were enugh to take Warsaw. Kind regards.

Bóg,Honor i Ojczyzna,
komandos10

Polish infantrymen in the Thirties

Soldiers of the 24th Self-Propelled Artillery Regiment. The vehicel according to my source supossed to be SU-85. Polish eagle moderated. 

Polish People's Army

Polish Home Army soldiers draw a bead from behind what looks like a barricade composed of bedroom furniture, Warsaw Uprising, 1944.

The weaponry here is interesting.  The soldier on the left is using a Mauser 98K, presumably captured from the Germans at a reasonably recent time.  The man to the right, however, is using a a somewhat more unusual weapon - a Browning Automatic Rifle of, essentially the 1918 design (BAR M1918).  This was, depending on how one views it, an early light support machine gun, or alternatively the Daddy of all assault rifles.

The BAR M1918 was originally intended as a "trench sweeper" for specialist American units in WW1 (the US equivalent of German "stormtroops", more or less) but was found to be unsuitable due to its weight and relatively unweildly profile.  It went on to have a varied career, involving the production of several variants.

The BAR variant shown here is almost certainly adapted for Polish Army requirements, the main modification being recalibration to use Mauser-type 7.92 mm ammunition.  This variant - the Browning wz. 1928 - was originally manufactured by the ever-adaptable Belgian arms industry on behalf of Poland under license; subsequently, it was manufactured under licence in Poland.  In the following years, this weapon became the main light support automatic weapon for the Polish forces.  Presumably the weapon shown here was one of the many thousands in the arsenals of the Polish Army at the beginning of WW2.

With my limited horizons, I have only seen one BAR M1918, so the speak, in the flesh.  This was, when I saw it, displayed in the Belgian Musee de l'Armee in Brussels, in the WW1 section.  It was an "original" US model, held in the arms of a mannequin displaying American uniform of 1918.  A notable (and particularly American) feature of this weapon was the fixation over the top of the breach block of a nicely engraved little plaque (clearly attached while the rifle was being finished) asserting the patent of the Browning/Winchester corporation and stating the patent number and date.  Not, perhaps, the most relevant matter for the user, as he stood ankle-deep in muck somewhere in northern France but, well, you never know where intellectual property law is going to catch up with you ... Best regards, JR.