The Bofors 40 mm gun is a famous anti-aircraft autocannon designed by the Swedish firm of Bofors. It was one of the most popular medium-weight anti-aircraft systems during World War II.

1939 Polish-made Bofors 40 mm gun

The 7TP was the Polish light tank of the Second World War. A development of the British Vickers 6-ton, it was significantly better armed than its most common opponents, the German Panzer I and Panzer II. A standard tank of the Polish Army during the Polish Defensive War of 1939, its production never exceeded 140 vehicles. Its chassis was used as the base for C7P artillery tractor.
On photo also Polish motorcycle CWS 111 SOKOL 1000

1938 - Polish light tank 7TP & motorcycle CWS 111 

During the invasion of Poland in 1939, cavalry units were organised in 11 cavalry brigades, each composed of 3 to 4 cavalry regiments with organic artillery, armoured unit and infantry battalion. Two additional brigades had recently been converted to motorized and armoured units, but they retained their cavalry traditions. In addition, every infantry division had an organic cavalry detachment used for reconnaissance.