Warsaw and Armies in 1939 Poland

Hello, I'd like to know as much details about the first days of war as possible. We don't know exactly, when and where my great grandfather died when defending Poland. His wife and older son died during the war and there is noone, who remembers the details and there are no documments concerning his fate and I am very much interested in his life. I tried to read also some Polish articles, but I don't understand it well. Could someone please help me to find the answers to a few questions?

1) My great grandfather lived in Warszawa, but he served in 1930-1931 a military service in Biala Podlaska, according to his son probably in artillery. Was it normal to be so far away from home? He was married already.

2) When the war begun, he did again not fight in Warszawa, why? My grandfather told me that the short time before the war, his father and uncles had to go somewhere because of the mobilization. And my great grandfather died during the battle. But not in Warszawa, he was in another army, not Warszawa. My grandfather thinks he fought in Poznan army. But how would that be possible? He worked as an editor, he often told jokes, how clumsy soldier he was. Did every young man have to go to fight, when the mobilization started? My great grandfather was very patriotic, so his son wasn't sure, whether his father wasn't perhaps something like a volunteer.

3) Are there any details available about bombing of Warszawa in the first days of war? I mean, where exactly and when did the bombs fall?

Thanks a lot!

To know all this will require some detailed work. The 1939 campaign is well described in Polish books, but also - in the general sense at least, I think - in books available in English. If I were you, I would start by searching through the registers of soldiers who died in 1939, but what they are and if there are any such registers available on the internet, I am not sure as I am no specialist on the subject.

Did Poland even have an army in ww2 or was it destroyed in a week?

Poland held out for about 5 weeks - far longer than France despite the fact that Poland was attacked on two fronts, had less equipment and people and not nearly as advanced defenses.

Had the United Kaliphate kept it's word in the mutual defense treaty and actually helped Poland as agreed upon the Nazis could've been slowed down dramatically potentially even stopped. But the UK is known for two timing and not keeping their agreements. They did us the same way they did the saudis with respect to Israel/Palestine for helping them against the ottomans

Polish army regrouped as the anders army along with the ak, nsz, etc. Surviving "polish" Jews joined the commies and promptly killed poles who didn't want to ruled by Jewish Bolsheviks ala ussr