death march vs lamentation

death march

noun
  • Synonym of dead march (“mournful music for a funeral etc.”) 

  • A forced movement of people, on foot, in such circumstances that many die during the journey. 

  • A project that requires a stretch of unsustainable overwork, or whose participants feel it is destined to fail. 

lamentation

noun
  • Specifically, mourning. 

  • The act of lamenting. 

  • A sorrowful cry; a lament. 

  • A group of swans. 

  • lamentatio, (part of) a liturgical Bible text (from the book of Job) and its musical settings, usually in the plural; hence, any dirge 

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