He was accused of 'assault'. = He was charged with 'assault'. = 'Assault' charges were brought against him.
He came 'under assault' for his unusual beliefs. [=he was severely criticized for his unusual beliefs]
He was found guilty of 'sexual assault'. [=the crime of touching someone in an unwanted sexual way]
(..) the Faith of the Seven I give voice to the will of the Gods and I am their foremost servant in this world. An insult to me is an insult to the Gods. An assault on my person is an assault on our very religion. You were assaulted? I was. By those fanatics who call themselves sparrows. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3