Use A Sledgehammer To Crack A Nut Meaning

(idiomatic) To use significantly excessive force to carry out an action; to do something overzealously

Example: 2010 September 21, “'A sledgehammer to crack a nut': Three police officers and a patrol car rush to... children playing football in the street”[1], Daily Mail:
  Today, Mr Worthington, an engineer, said: 'Sending three officers over simply to give a warning about kids playing football in the street is like using a sledgehammer to crack a nut.