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]
(..) -lt ain't up to me. you know. One... ...two. three... ...tour.... You've got at least... ...tive arrests tor assault. What can you tell me about that? Five tights. huh? Rocky Marciano's got . and he's a millionaire. -That's true. (..)1975 One Flew Over the Cuckoo's Nest