She believed that she was an 'instrument' of God. [=she believed that God was using her to do things; she believed that God was acting through her]
Part of her training as a pilot involved learning to fly by 'instruments'. [=learning to fly only by looking at the instruments in the airplane]
Movies can be useful 'instruments' of social change. [=movies can be used to cause social change]
(..) I have done for you. You have seen all you needed to? EGIL: They are not as safe as they think they are. The greatest army ever assembled. Our instruments of wrath. Ivar wants to lead the army. He thinks our father chose him. Bjorn should lead the army. I am the leader of this great army. (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19