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]
(..) Yeah, he's a king. Seems like I'm always thanking you for something. What are you doing? Uh, we don't do that here. So how big of an assault should we expect? Uh, sir, I think you should expect quite a big assault. How we looking? You will have my Kingsguard, (..)2018 Avengers: Infinity War
(..) we are under assault. The engines are dead, life support failing. Requesting aid from any vessel within range. We are jump points (..)2018 Avengers: Infinity War