Battle vs Underground

Battle

name
  • A habitational surname from Middle English from places in England that have been sites of a battle. 

  • A town in East Sussex, England; supposed site of the Battle of Hastings. 

  • A hamlet in Yscir community, Powys, Wales (OS grid ref SO0131). 

  • A river in Saskatchewan, Canada 

  • A former unincorporated community in Carbon County, Washington, United States. 

Underground

name
  • The London Underground. 

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