 As the Yishuv grew, the immigrants arriving from the diaspora did not speak Hebrew as a mother tongue, and learned it as a second language either prior to their immigration or in Palestine, while their children picked up Hebrew as their native language.At this time, the use of Hebrew as the "lingua franca" of the Yishuv was already a" fait accompli", and the revival process was no longer a process of creation, but a process of expansion.In Tel Aviv, the Legion of the Defenders of the Language was established, which worked to enforce Hebrew use.