Perhaps the date has something to do with when he reported to the military in Rumania after escaping. A commission on the 1st September looks like he was still a cadet at the outbreak of war. Perhaps he was one of the 50 officer cadets that Urbanowicz took to Rumania on a requisitioned coach. If so, he would not have seen any action. “They wanted to fight and I kept explaining to them that I understood their desire to grab a gun and have a go at the enemy, but that they would make lousy infantry men. They were worth more in the air ….. My job was to take them where they could again climb into the cockpit of the fighter plane.”
Conditions in Bron-Lyons were pretty grim. These days they would be called ‘severe depredation.’ The French divided the Poles into professional soldiers and reservists. Reservists received only minimum pay on which it was impossible to survive. Likely it was these conditions that caused his illness. A full account can be found in Grzegorz Śliżewski’s Stracone Złudzenia The Lost Hopes (bilingual). It seems it is still available.
https://www.ianallanpublishing.com/product.php?productid=14044&cat=0&page=1
Accommodation at Foire – that’s water on the floor.