The Nazi invasion of Poland in September 1939 saw mostly untested German troops face equally inexperienced Polish forces. With the Polish senior leadership endeavouring to hold the country's industrialized east, Hitler's forces unleashed what was essentially a large pincer operation intended to encircle and eliminate much of Poland's military strength. Harnessing this initial operational advantage, the Germans were able to attack Polish logistics, communications and command centres, thereby gaining and maintaining battlefield momentum. With the average infantry soldier on both sides comparatively well-led, equipped and transported, vital differences in battlefield support (especially air power and artillery), tactics, organization and technology would make all the difference in combat.