drive a wedge between vs sunder

drive a wedge between

verb
  • To separate. 

  • To cause dispute or hostility between. 

sunder

verb
  • To part, separate. 

  • To break or separate or to break apart, especially with force. 

noun
  • a separation into parts; a division or severance 

How often have the words drive a wedge between and sunder occurred in a corpus of books? (source: Google Ngram Viewer )