Step 1: Understanding the Question:
The question asks what M. Hamel's first announcement or statement was on the day of the last lesson in the chapter "The Last Lesson".
Step 2: Recalling the Scene:
On that day, Franz noticed that the atmosphere in the class was unusually solemn. After Franz had taken his seat, M. Hamel mounted his chair and made the momentous announcement.
Step 3: Detailed Explanation:
M. Hamel's first words to the class were a shocking revelation. He told his students, "My children, this is the last lesson I shall give you." He explained that the order had come from Berlin that from now on, only German would be taught in the schools of Alsace and Lorraine. He added that the new master would come the next day. This announcement was the reason for the unusual silence and sadness in the classroom.