The kids from Champigny are unwelcome in Joinville,

These white posters that appeared the other morning on the walls of Joinville-le-Pont are not the ordinary communication of a vigilant municipality to its valiant fellow citizens. The tone is serious and the sentence solemn. Definitive words appear there. So it is a curious story.

It seems that there are too many children in the schools of Joinville, at least in those of the Polangis group, avenue Oudinot. To accommodate everyone, tables had to be installed under the covered playgrounds. The architects even declared that, if the numbers did not decrease, it would be necessary to build two new classes without delay and to reinforce the staff.
Well, as encouraging as it seems, in these times of depopulation, this situation is rather poorly appreciated by the municipality of Joinville.
By consulting the list of Polangis students, she found, in fact, that ninety of them were not domiciled in the territory of the commune, but in that of Champigny.

Then, the following dialogue began:
We have in our schools ninety children who do not belong to us and who are clearly yours, Champigny. We are willing to keep them all the same. Just reimburse us for the cost of notebooks and prize books that we have agreed to for them. There are 2,000 francs worth. Pay them.

"Not at all," Champigny retorted. "Our schools are big enough to accommodate all the children of the commune. Now, if there are parents who prefer to send them to yours, that is their business. Let them sort it out with you…

In which both parties, as we see, could also invoke arguments of pure reason, geography being the only one responsible. But the matter got complicated. The municipality of Joinville ended up getting angry and, on July 25, it made this decision:
From October 1, 1924, none of these children will be admitted to receive instruction in the schools of Joinville, if the municipality of Champigny does not agree to bear the costs.

Champigny did not give in, and the deadline provided for in the ultimatum expires Tuesday evening, at midnight.
At the time when the irreparable is about to occur, the mayor of Joinville, Mr. Vel-Durand, therefore issued a proclamation to the people of Joinville, "in order to make them judges of the municipal decision."