Protesters formed 'a human chain' [=they stood next to each other with their arms linked] around the ancient tree to prevent it from being cut down.
In the United States, the President as the commander in chief is at the head of the military 'chain of command'.
I thought he really won the lottery but he was only 'pulling my chain'. [=he was only playing a joke on me]
(..) I do not know, My Lord. You have no idea? your sword, Is it too hot? Of course, My Lord. Very good. Let the "Six" of the chain. let them bring me these stupid people. possible in very small, appetizing pieces. Yes, My Lord. How good that you could overcome the pitfall Claudius. (..)2011 The Dragon Warrior