base camp vs laager

base camp

noun
  • An encampment used temporarily for storing supplies and preparing for a larger activity, such as mountain climbing or hunting. 

laager

noun
  • A defensive encampment encircled by wagons, especially by South African Boers. 

  • A temporary formation of armoured vehicles for resupply. 

verb
  • To arrange in a circular formation for defence. 

  • To camp in a circular formation. 

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