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]
(..) Plant one and watch the thing die. We are down units of gasoline,... ... canisters of nitro,... ... assault bikes,... ... pursuit vehicles. My deficit mounts. And now, sir,... ...you, have us stuck in a quagmire! (..)2015 Mad Max: Fury Road