Although the Polish Army would have outnumbered the attacking German army — the Wehramcht — once it had all been mustered, the Germans were met by 17 ill-equipped infantry division. The Poles had just one armored brigade — 660 tanks in all, versus Germany's 2,100. It was during the Invasion of Poland that the last cavalry charge in the history of warfare was made by the Polish horseman against German tanks.
"Friends" soon to be bitter enemies: German and Soviet troops meet during the German-Soviet invasion of Poland in Sept 1939. Berlin and Moscow divided Poland among themselves. In less than two years after this photo was taken, the Wehrmacht rolled across the Soviet frontier.
Stanisław Ignacy Witkiewicz, commonly known as "Witkacy", was a Polish poet, playwright, novelist, painter, photographer and philosopher. After hearing the news of the Soviet invasion of Poland on 17 September 1939, Witkacy committed suicide on 18 September by taking a drug overdose and trying to slit his wrists. He convinced his young lover Czesława to attempt suicide with him by consuming Luminal, but she survived. Source: Wikipedia.