The infantry was the most numerous and one of the most important formations in the Polish armed forces in the interwar period and during the September Campaign. During the September Campaign of 1939, the main operational unit of the Polish infantry – as in almost every European army of the time – was the division, which after mobilization was to reach approximately 16,500 soldiers. Its main striking force was three infantry regiments, supported by anti-aircraft and anti-tank artillery (27 37 mm guns as standard) and light and heavy artillery (24 or 12 75 mm guns as standard, 12 or 24 100 mm guns, 3 105 mm guns and 3 155 mm howitzers). It is worth adding that the Polish infantry division had many disadvantages compared to the German division. First of all, it had fewer machine guns and, above all, light and heavy artillery. Moreover, in the case of the Wehrmacht, the latter were much better equipped with vehicles, which improved their mobility, and had much better means of communication and communications. For example: a German infantry division had 938 regular vehicles, while a Polish one had only 76 motorized vehicles! This affected the effectiveness of both formations on the battlefield, as well as their firepower and mobility.
