unsheath vs unsheathe

unsheath

verb
  • To deprive of a sheath; to draw from the sheath or scabbard, as a sword. 

unsheathe

verb
  • To deprive of a sheath; to draw from the sheath or scabbard, as a sword. 

How often have the words unsheath and unsheathe occurred in a corpus of books? (source: Google Ngram Viewer )