encirclement vs penning

encirclement

noun
  • The act of encircling or the state of being encircled 

  • The isolation of a target by the formation of a blockade around it 

penning

noun
  • Writing; literary composition. 

  • An old currency unit, the Swedish penning. 

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