The principle of tower and stockade settlements was first explained to me at Camp Seneca Lake when I was a counselor sometime between 1962-4.  A counselor who was a former resident of Hanita set up a day of games called tower and stockade that reflected his parents’ history.  

Because of the upcoming division between Israel and Palestine, Ben Gurion and other leaders wanted to set up some Jewish settlements that would be fait accompli, and if a tower and fence were present, the settlement would not be destroyed by the British.   Divided into British, Jewish, and Arab groups, we took our roles so seriously that I fell off a cliff while escaping the British soldiers.  

Hanita was the only place not already in existence when the program was initiated during the 1936-9 Arab riots against Jewish settlement.  Remote and unprotected, it was a particular challenge to set up.  The ruins of an old village, that was so old it was mentioned in the bible and appears on ancient maps, it was not easy to get to, much less defend.  

There is some of the history of the kibbutz on Wikipedia https://en.wikipedia.org/wiki/Hanita

But there is a better film in Hanita itself.

It is on the border of Lebanon, and as I realized in striking up a conversation with a random villager who had a heavy Arabic accent, it shelters some of the Arab population escaping from the north.