What changes did the order from Berlin cause in school that day?

After the order to impose German in France, Mr. Hamel was going to leave and German was to be taught then onwards. There was no noise in the school. Everybody studied patiently. Mr. Hamel wore the clothes, he used to wear only on special occasions and some important and eminent people from the area, the postmaster, the mayor and others were sitting at the last benches of the classroom.