question: How many years after the end of the Great War in which Britain fought France did John Holland Rose publish a book titled William Pitt and the Great War?
#1 return the  end of the   Great War in  which Britain fought France 
#2 return John Holland Rose publish a book titled William Pitt and  the  Great War 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3