I was aware that news and letters were brought into the city by carrier pigeons with microfilm, but I wasn’t aware that news and post from the city(along with the carrier pigeons themselves that would later return) were brought out by constructing one way balloons out of the diminishing resources for a harrowing flight over occupied France with a shrinking pool of pilots.
The article stated unoccupied territory. This isn’t the same as moving into other countries?
You’re right, I misread it thinking they chased them to Belgium.