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]
(..) I'll go to Davis and visit you every day. ...now I want Spirits to enforce, art to enchant, And my ending is despair, Unless I be relieved by prayer, which pierces so that it assaults mercy itself and frees all faults. As you from crimes would pardoned be, let your indulgence set me free. Yeah! (..)2017 Lady Bird