On September 1, 1939, a small but industrially important part of Czechoslovakia from Bohumín to Jablunkov on the left bank of the Olza River, which was occupied by Poland and became part of it, did not witness fierce fighting on September 1, 1939. Despite its economic importance, the Poles did not intend to defend it steadily, but preparations for World War II and the course of its first day were recorded in municipal chronicles, Polish historiography, as well as in German war documents.
How World War II in the air began? These were not the massive attacks of hundreds of bombers and the persistent fighting of fighter groups we know from later periods of this war. However, the actors of its beginning on both warring parties showed a lot of determination, which from the point of view of the intensity of later events seems insignificant, little known, but still very interesting.